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577. What is BlueJacking?

http://telegra.ph/What-is-Bluejacking-07-10
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577. What is BlueJacking?

http://telegra.ph/What-is-Bluejacking-07-10
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578. What is 21 grams Experiment?

The 21 grams experiment refers to a scientific study published in 1907 by Duncan MacDougall, a physician from Haverhill, Massachusetts. MacDougall hypothesized that souls have physical weight, and attempted to measure the mass lost by a human when the soul departed the body. MacDougall attempted to measure the mass change of six patients at the moment of death. He also stated his experiment would have to be repeated many times before any conclusion could be obtained. The experiment is widely regarded as flawed and unscientific due to the small sample size.
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579. What's an EFT? How does it works?

An electronic funds transfer (EFT) is a transaction that takes place over a computerized network, either among accounts at the same bank or to different accounts at separate financial institutions.
EFTs include direct-debit transactions, wire transfers, direct deposits, ATM withdrawals and online bill pay services. Transactions are processed through the Automated Clearing House (ACH) network, the secure transfer system of the Federal Reserve that connects all U.S. banks, credit unions and other financial institutions.
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580. What are new technologies used in Cricket matches?

http://telegra.ph/What-are-the-technologies-used-in-Cricket-matches-09-15
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581. What is Fracking Technology ?

Fracking is the process of drilling down into the earth before a high-pressure water mixture is directed at the rock to release the gas inside. Water, sand and chemicals are injected into the rock at high pressure which allows the gas to flow out to the head of the well.
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582. What is GyroCompass?

A gyrocompass is a type of non-magnetic compass which is based on a fast-spinning disc and the rotation of the Earth (or another planetary body if used elsewhere in the universe) to find geographical direction automatically.
A Gyro compass is a form of gyroscope, used widely on ships employing an electrically powered, fast-spinning gyroscope wheel and frictional forces among other factors utilising the basic physical laws, influences of gravity and the Earth's rotation to find the true north.
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583. Why don't mercury & Venus have moon?

Mercury doesn't have a gravitational pull powerful enough to hold anything else in orbit around itself. That's why it doesn't even have an atmosphere. And proximity to the Sun ensures that any object coming within Mercury's vicinity is sucked into the Sun directly. Even if Mercury did have a small satellite, the Sun's pull would disturb the orbit of the satellite, causing it to fall into the planet.
While Venus has a greater gravitational pull, it still faces the same problem. It's simply too close to the sun to hold on to another body.
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584. What is Blue Water Gas?

A gas consisting mainly of carbon monoxide and hydrogen, made by passing steam over red-hot coke and burning with a blue flame, used especially as a source of hydrogen; also called blue gas, water gas.
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585. What is Coke?

Coke is a fuel with few impurities and a high carbon content, usually made from coal. It is the solid carbonaceous material derived from destructive distillation of low-ash, low-sulphur bituminous coal. Coke is also used to manufacture water gas.
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586. What's IOT?

The Internet of Things (IoT) is a system of interrelated computing devices, mechanical and digital machines, objects, animals or people that are provided with unique identifiers and the ability to transfer data over a network without requiring human-to-human or human-to-computer interaction.
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589. Who developed the touchscreen?

E.A. Johnson is believed to be the first to developed the touchscreen in 1965. But the tablet, which was patented in 1969, could only read one touch at a time, and it was used for air traffic control until about 1995.
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590. How the first cataract surgery was done?

The Sushruta Samhita documents cataract surgery. The patient had to look at the tip of his or her nose while the surgeon, holding the eyelids apart with thumb and index finger, used a needle-like instrument to pierce the eyeball from the side. It was then sprinkled with breast milk and the outside of the eye bathed with a herbal medication. The surgeon used the instrument to scrape out the clouded lens until the eye “assumed the glossiness of a resplendent cloudless sun”. During recovery it was important for the patient to avoiding coughing, sneezing, burping or anything else that might cause pressure in the eye. If the operation were a success, the patient would regain some useful vision, albeit unfocused.
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591. Are Live Broadcasts are actually Live?

In radio and television, broadcast delay is an intentional delay (often seven seconds) when broadcasting live material. The delay is to prevent mistakes or unacceptable content from being broadcast.
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592. What's Turing Award?

The ACM (Association for Comouting Machinery) Turing Award, often referred to as the “Nobel Prize of Computing,” carries a $1 million prize, with financial support provided by Google, Inc. It is named for Alan M. Turing, the British mathematician who articulated the mathematical foundation and limits of computing.
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593. What happens to your voice when you inhale hydrogen or helium gas?

http://telegra.ph/Why-does-Helium-change-the-sound-of-your-voice-10-24
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594. What's Google Lens?

Google Lens is a feature announced by Google during Google I/O 2017. It is designed for bringing up relevant information based on what your camera sees. For example, if you point your camera to a Wi-Fi sticker, the app will automatically connect to the Wi-Fi source that has been scanned. It is integrated with the Google Photos and Google Assistant apps.
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595. How landmines work?

These mines continue to be functional for many decades, causing further damage, injury and death. Landminesare basically explosive devices that are designed to blow when triggered by pressure or a tripwire. These devices are typically found on or just below the surface of the ground.
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596. What is Coriolis Effect?

http://telegra.ph/What-is-Coriolis-Effect-10-23
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597. What is milk ejection reflex?

http://telegra.ph/What-is-milk-ejecting-reflex-10-27
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598. What does Termite do?

Termites are detritivores, or detritus feeders. They feed on dead plants and trees. Termites get nutrients from cellulose, an organic fiber found in wood and plant matter. Wood makes up the majority of the pests' diet, although termites also eat other materials such as paper, plastic, and drywall.
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599. What is Wanna Cry?

A global cyber attack has been underway , affecting more than 200,000 organisations in 150 countries. In the UK, the major assault hit 47 NHS trusts, leading to operations being cancelled and patients turned away from A&E.
The "WannaCry" ransomware appears to have used a flaw in Microsoft's software, discovered by the National Security Agency and leaked by hackers, to spread rapidly across networks locking away files. 
A security expert managed to stop the attack by triggering a "kill switch" but it has continued to wreak havoc. 
Ransomware, which demands payment after launching a cyber attack, has become a rising trend among hackers looking for a quick payout. 
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600. What is Aquila?

Facebook has revealed its first full-scale drone, which it plans to use to provide internet access in remote parts of the world.
Code-named “Aquila”, the solar-powered drone will be able to fly without landing for three months at a time, using a laser to beam data to a base station on the ground.
The company plans to use a linked network of the drones to provide internet access to large rural areas. However, as with its Internet.org project, Facebook will not be dealing with customers directly, instead partnering with local ISPs to offer the services.
Jay Parikh, Facebook’s vice-president of engineering, said: “Our mission is to connect everybody in the world. This is going to be a great opportunity for us to motivate the industry to move faster on this technology.
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601. How do Rainbow form?

A rainbow is a meteorological phenomenon that is caused by reflection, refraction and dispersion of light in water droplets resulting in a spectrum of light appearing in the sky. It takes the form of a multicolored circular arc. Rainbows caused by sunlight always appearing in the section of sky directly opposite the sun.
Rainbows can be full circles. However, the observer normally sees only an arc formed by illuminated droplets above the ground, and centered on a line from the sun to the observer's eye.
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602. What Solvent is used in Permanent Marker?

A permanent marker or indelible marker is a type of marker pen that is used to create permanent writing on an object. In general, the ink comprises a main carrier solvent, a glyceride, apyrrolidone, a resin and a colorant, making it waterproof.
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603. Why does Aspirin help during a Heart Attack?

Platelets are cells that clump together and help to form blood clots. Aspirin keeps platelets from clumping together, thus helping to prevent or reduce blood clots. During a heart attack. Blood clots form in an already-narrowed artery and block the flow of oxygen-rich blood to the heart muscle.
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604. Why does Hot water cool more faster than Cold water?

The cooling rate of water or any other substance depends on the temperature difference between the object and the atmosphere. Greater the temperature difference, faster the rate of cooling. Well, to understand this better, take the case of two interconnected beakers, one with medium water level and the other with small water level. Water flows. But, if the water level is very high in the beaker, water flows even faster. This cooling phenomenon was discovered by Sir Isaac Newton, and is popularly known as Newton's law of cooling.
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605. What is Retinal scanning?

The human retina is a thin tissue composed of neuralcells that is located in the posterior portion of the eye. Because of the complex structure of the capillaries that supply the retina with blood, each person’s retina is unique. The network of blood vessels in the retina is so complex that even identical twins do not share a similar pattern. Although retinal patterns may be altered in cases of diabetes, glaucoma or retinal degenerative disorders, the retina typically remains unchanged from birth until death.
A biometric identifier known as a retinal scan is used to map the unique patterns of a person’s retina. The blood vessels within the retina absorb light more readily than the surrounding tissue and are easily identified with appropriate lighting. A retinal scan is performed by casting an unperceived beam of low-energy infrared light into a person’s eye as they look through the scanner’s eyepiece. This beam of light traces a standardized path on the retina. Because retinal blood vessels are more absorbent of this light than the rest of the eye, the amount of reflection varies during the scan. The pattern of variations is converted to computer code and stored in a database.
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606. What are seeds, peers, trackers, pieces in uTorrent?

Torrents are peer-to-peer file transfer protocol. That means, there is no central source for the files, people download files which are being uploaded by others (in real time).
Seeds: Number of peers who have already downloaded the files, and are currently uploading them.
Peers (or Leechers): A leecher is any peer that does not have the entire file and is downloading the file.
Trackers: A tracker is a server that keeps track of which seeds and peers are in the swarm (swarm: all peers sharing a torrent - uploading or downloading).
Pieces: This refers to the torrented files being divided up into equal specific sized pieces (e.g., 64kB, 128kB, 512kB, 1MB, 2MB or 4MB). The pieces are distributed in a random fashion among peers in order to optimize trading efficiency.
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607. What country has the highest number of spoken languages in the world?

Papua New Guinea has the highest number of spoken languages in the world. There are 820 indigenous languages spoken in this country. The official language is Tok Pisin, or New Guinea Pidgin, and is the most widely spoken language after English, a legacy of the colonial period.
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607. What country has the highest number of spoken languages in the world?

Papua New Guinea has the highest number of spoken languages in the world. There are 820 indigenous languages spoken in this country. The official language is Tok Pisin, or New Guinea Pidgin, and is the most widely spoken language after English, a legacy of the colonial period.
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608. How do Antibiotics work?

Antibiotics work by affecting things that bacterial cells have but human cells don't. For example, human cells do not have cell walls, while many types of bacteria do. The antibiotic penicillin works by keeping a bacterium from building a cell wall.
Antibiotics either stop bacteria from reproducing or destroy them. Before bacteria can multiply and cause symptoms, the body'simmune system can usually kill them. Our white blood cells attack harmful bacteria and, even if symptoms do occur, our immune system can usually cope and fight off the infection. Antibodies don't work on viruses, Viruses insert their genetic material into a human cell's DNA in order to reproduce. Antibiotics cannot kill viruses because bacteria and viruses have different mechanisms and machinery to survive and replicate. The antibiotic has no “target” to attack in a virus.
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609. What is E-Gold?

E-gold was a digital gold currency operated by Gold & Silver Reserve Inc. (G&SR) under e-gold Ltd. that allowed users to open an account on their web site denominated in grams of gold (or other precious metals) and the ability to make instant transfers of value ("spends") to other e-gold accounts.
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610. How many watts are equal to 1 unit in an electricity bill?

The electricity bills are nothing but energy consumption bills and not power consumption bills.
Energy=Power * time
When we say we have consumed 1 unit of electricity, that means we have consumed 1kWhr of electrical energy.
1 Unit=   kilo watt hour.
So, for example if you use 10 watt of lamp for 100 hours, the electricity consumed will be 1000 watt hour. That is 1kWhr, nothing but 1 Unit of Electrical Energy.
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611. How do toilet cistern work?

http://telegra.ph/How-does-toilet-cistern-work-11-07
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612. Why are the tyres of the car black?

Actually Carbon Black is not added as a coloring agent,it is a filler. Vulcanized rubber does not have very good wear resistance and hence a tire made of pure vulcanized rubber would wear out soon.
Carbon Black also increases the damping properties of rubber, thus transferring less shock loads to the automobile.
In addition to this Carbon Black is a good conductor of heat and would help conduct heat away from the surface with contact to the road and help maintain a healthy tire temperature.
An added bonus is that addition of carbon black increases the coefficient of friction with the road surface thus making it safer to drive.
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613. What is Micturition syncope?

Micturition syncope or post-micturition syncope is the name given to the human phenomenon of fainting shortly after or during urination. The underlying cause is not fully understood but it may be a result of vasovagal response, postural hypotension, or a combination thereof.
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614. What is speed bumps, speed humps and speed cushions?

Speed bumps (or speed breakers) ,humps, cushions are the common name for a family of traffic calming devices that use vertical deflection to slow motor-vehicle traffic in order to improve safety conditions. 
Speed Bumps: For 5-15 MPH Reduce to 2-5 MPH
Parking lots and Driveways
Various Lengths: 4',6',9',10', and 12'
Speed Humps: For 15-30 MPH - Reduce to 5-10 MPH
Residential Streets and Campuses.
Adjustable Lengths: Sold as 19.5' Pieces.
Speed Cushions: For 45-30MPH-Reduce to 15-20MPH
Emergency or Bus Routes and Airports.
Standard Length.
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615. What is difference between Yoghurt and Curd?

Yogurt and curd are two different types of dairy products. These two are two different forms of milk that are created by fermenting milk in some way. Yogurt and curd play an important part in cooking and diet in many different cultures around the world. These are completely different from each other in almost every aspect.
Yogurt is a diary product that is created by fermenting milk using bacteria. The bacteria that is used to ferment milk is known as ‘yogurt cultures’. The bacteria ferment the lactose in the milk causing it to produce lactic acid, which gives yogurt its tangy and acidic taste.
Curds are another type of dairy product. Curds are made by curdling or coagulating the milk. This can be done by mixing edible acidic substances in to the milk, such as lemon juice or vinegar. Introducing these substance to the milk, will allow the milk to curdle and separate into two parts. The liquid part is the whey and the milk solids will be the curds. The whey contains the whey proteins of the milk, whereas the curds are the milk proteins or casein. Sometimes old milk might sour and separate without the added acidic substances.
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616. Which was the first Nuclear Submarine?

USS Nautilus (SSN-571) was the world's first operational nuclear-powered submarine. The vessel was the first submarine to complete a submerged transit of the North Pole on 3rd August 1958. 
On July 23, 1958, NAUTILUS departed Pearl Harbor, Hawaii under top secret orders to conduct "Operation Sunshine", the first crossing of the North Pole by a ship.
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617. What is the difference between Mbps and MBps?

The Difference between a Megabyte (MB) and a Megabit (Mb).
One thing that often gives people confusion is the difference between a Megabyte (used for file size) and a Megabit (used for download speeds). People often assume that a download speed of 1 Megabit per second (1 Mbps) will allow them to download a 1 Megabyte file in one second. This is not the case, a Megabit is 1/8 as big as a Megabyte, meaning that to download a 1 MB file in 1 second you would need a connection of 8 Mbps. The difference between a Gigabyte (GB) and a Gigabit (Gb) is the same, with a Gigabyte being 8 times larger than a Gigabit.
Mbps means megabits per second. Mb is used for download and upload speed.
MBps stands for megabytes per second. MB is used for file size.
You’ll spot these terms when you download a file from the Internet or transfer data from one device to another. They show the data transfer rate. Your connection speed (download and upload) will display as megabits per second. But, you’re downloading or transferring megabytes.
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618. What is Blue Screen Of Death?

A stop error, better known as blue screen of death (BSoD), is an error screen displayed on a Windows computer system after a fatal system error, also known as system crash: when the operating system reaches a condition where it can no longer operate safely.
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619. What is Gestational diabetes?

Gestational diabetes is a condition in which a woman without diabetes develops high blood sugar levels during pregnancy. Gestational diabetes generally results in few symptoms; however, it does increase the risk of pre-eclampsia, depression, and requiring a Caesarean section. Babies born to mothers with poorly treated gestational diabetes are at increased risk of being too large, having low blood sugar after birth, and jaundice. If untreated, it can also result in a stillbirth. Long term, children are at higher risk of being overweight and developing type 2 diabetes.
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620. What is hematopoiesis?

It refers to the production of all types of blood cells including formation, development, and differentiation of blood cells. Prenatally, hematopoiesis occurs in the yolk sack, then in the liver, and lastly in the bone marrow. In the normal situation, hematopoiesis in adults occurs in the bone marrow and lymphatic tissues. All types of blood cells are derived from primitive cells (stem cells) that are pluripotent (they have the potential to develop into all types of blood cells.
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621. Who designed the White House and who lived at the White House first?

The residence was designed by Irish-born architect James Hoban in the neoclassical style. Construction took place between 1792 and 1800 using Aquia Creek sandstone painted white. When Thomas Jefferson moved into the house in 1801, he(with architect Benjamin Henry Latrobe) added low colonnades on each wing that concealed stable and storage.
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622. What is Atlas Robot?

Atlas is a bipedal humanoid robot primarily developed by the American robotics company Boston Dynamics, with funding and oversight from the United States Defense Advanced Research Projects Agency (DARPA). The 1.8-meter (6 ft) robot is designed for a variety of search and rescue tasks, and was unveiled to the public on July 11, 2013.
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623. What is the history of Hole Punch?

The origin of humble office tool hole puncher or hole punch are quite unknown. For the first time, the two-hole punch was introduced by Friedrich Soennecken, a German businessman and inventor, on 14 November 1886. It was called Papierlocher für Sammelmappen (paper hole maker for binding). The design has not much changed after this invention.
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624. What is underwater Hockey known as?

Underwater Hockey (UWH), also known as Octopush (mainly in the United Kingdom) is a globally played limited-contact sport in which two teams compete to manoeuvre a puck across the bottom of a swimming pool into the opposing team's goal by propelling it with a hockey stick (bat).
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625. Do mosquitoes have teeth?

Mosquitoes have a long tube attached to their mouth, which is designed like a hollow needle called a proboscis. Using their proboscis, mosquitoes are able to pierce your skin and extract your blood, like they were sipping it out of a straw. Consider yourself one, big, mosquito soda fountain!
A mosquito’s proboscis has 47 sharp edges on its tip to help it cut through skin and even protective layers of clothing. Perhaps this is where the rumor of “mosquito teeth” comes from. Unlike human teeth, however, these sharp edges are not used to chew food since blood is already in a liquid form. These sharp edges are simply used to cut through skin. The pain you feel the moment a mosquito “bites” you is therefore not from the mosquito taking an actual bite out of your skin, but instead the pain from the initial stab of sticking its proboscis into you.
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626. How does Face Recognition Technology work?

http://telegra.ph/How-does-Face-recognition-technology-work-11-13
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627. What is the difference between Internet and Intranet?

Even today, many businesses and large organizations rely on an intranet to help their employees stay connected.
There’s one major distinction between an intranet and the Internet: The Internet is an open, public space, while an intranet is designed to be a private space. An intranet may be accessible from the Internet, but as a rule it’s protected by a password and accessible only to a company’s employees or other authorized users.
From within a company, an intranet server may respond much more quickly than a typical website. This is because the public Internet is at the mercy of traffic spikes, server breakdowns, and other problems that may slow the network.
Within a company, however, users have much more bandwidth and network hardware may be more reliable. This makes it easier to serve high- bandwidth content, such as audio and video, over an intranet.
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628. What is Pavlov's dog?

Ivan Pavlov was a Russian physiologist who performed an experiment involving a dog, food, and a bell.
Whenever food is presented to a dog, it would (naturally) salivate. In his experiment, Pavlov combined the ring of a bell whenever he presented food to the dog.
After a number of repeats of this procedure, he rang the bell on its own without presenting any food. The bell on its own now caused an increase in salivation in the dog, as if the dog is 'conditioned' to associate the neutral ring of the bell to yummy food delivery.
This experiment in 1890s became one of the first learning theories in cognitive sciences, termed classical conditioning or pavlovian conditioning.
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629. What do astronauts drink?

Silly question. We know it's water!

But then comes the difficult question: how do they have large amount of water supplies for months?

Recycle is the answer.
The space station has a complex water system that squeezes every last drop of available, drinkable liquid out of the environment. In simple terms, astronauts are drinking a filtered mixture that includes recycled shower water, sweat, and urine. This ensures they have continous supply of water during their missions.
Oh, and don't worry. The processed water is super clean and "tasted like bottled water".
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630. What does the Power symbol denote?

http://telegra.ph/What-does-the-power-symbol-denote-11-16
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631. Why does it burn when you drink Alcohol?

Anyone who's ever taken a shot of hard liquor can tell you: it burns on the way down. But it's not the alcohol itself that's burning your throat. Instead, the ethanol in the liquid is making your throat's VR1 heat receptors more sensitive, prompting them to perceive your own body temperature as hot.
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632. Who is Lucy?

Lucy is the common name of AL 288-1, several hundred pieces of bone fossils representing 40 percent of the skeleton of a female of the hominin species Australopithecusafarensis. In Ethiopia, the assembly is also known as Diniknesh, which means "you are marvelous" in the Amharic language. Lucy was discovered in 1974 in Africa, near the village Hadar in the Awash valley of the Afar triangle in Ethiopia, by paleoanthropologist Donald Johanson of the Cleveland Museum of Natural History.
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633. What causes boiled egg yolks to turn green?

The green ring around the yolk of a hard cooked egg happens because hydrogen in the egg white combines with sulfur in the yolk. The cause is most often related to boiling the eggs too hard for too long. The green ring can also be caused by a high amount of iron in the cooking water.
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634. How does a Pitcher plant eat?

Foraging, flying or crawling insects such as flies are attracted to the cavity formed by the cupped leaf, often by visual lures such as anthocyanin pigments, and nectar bribes. Furthermore, some pitcher plants contain mutualistic insect larvae, which feed on trapped prey, and whose excreta the plant absorbs.
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634. How does a Pitcher plant eat?

Foraging, flying or crawling insects such as flies are attracted to the cavity formed by the cupped leaf, often by visual lures such as anthocyanin pigments, and nectar bribes. Furthermore, some pitcher plants contain mutualistic insect larvae, which feed on trapped prey, and whose excreta the plant absorbs.
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635. What is world's strongest light beam?

The sky beam of the Luxor Hotel and Casino in Las Vegas is the strongest beam of light in the world.
At 42.3 billion candela, the Luxor Sky Beam is the strongest beam of light in the world, using computer-designed, curved mirrors to collect the light from 39 xenon lamps and focus them into one intense, narrow beam. On a clear night, the Sky Beam is visible up to 275 miles (443 km) away by aircraft at cruising altitude, such as over Los Angeles.
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636. How did Yahoo! get its name?

Yahoo! is an acronym for Yet Another Hierarchical Officious Oracle. The original name was "Jerry and Davis's Guide to the World Wide Web," named after Jerry Yang and Davis Filo, the founding members of the company.
Yahoo! includes an exclamation mark in its name because there were already other companies named Yahoo. With this unique identifier, the founders were able to trademark it.
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637. What is Phantom Vibration Syndrome?

An expert is warning about a modern-day phenomenon called phantom vibration syndrome, where people think their mobile phone is ringing or vibrating when it's not. Today mobile phones are causing the hallucinations, but in the 1990s, people reported “phantom pager syndrome".
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638. What causes mothballs to slowly disappear over time?

Mothballs are made of Naphthalene which is an organic compound with a significant vapor pressure. When a compound evaporates without melting, it is said to sublime. That is what naphthalene does. It very slowly passes from the solid state-the little pellets, to the vapor phase. In a sealed space, the vapors build up to a level that is toxic to moths and the larvae.
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​​​​639. What does CE on every
Electronic Device
represent?

CE marking is a certification mark that indicates conformity with health, safety, and environmental protection standards for products sold within the European Economic Area (EEA). The CE marking
is also found on products sold outside the EEA that are manufactured in, or designed
to be sold in, the EEA. This makes the CE marking recognizable worldwide even to people who are not familiar with the European Economic Area. It is in that sense similar to the FCC Declaration of Conformity used on certain electronic
devices sold in the United States.
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640. Which is Microsoft's first operating system?

Microsoft's first operating system, MDOS/MIDAS, was designed along many of the PDP-11 features, but for microprocessor based systems. MS-DOS, or PC DOS when supplied by IBM, was based originally on CP/M-80. Each of these machines had a small boot program in ROM which loaded the OS itself from disk.
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641. Why is antarctica considered as the biggest desert?

By definition, a 'desert' is not decided by its temperature. A desert is a region that is simply very dry because its receives little to no water. To be considered a desert, an area must receive than 250 millimeters of annual precipitation. That's why it's easy for us to associate desert with 'hot, sandy areas' such as Sahara in Africa or Gobi in China.
The Antarctic Desert is the largest desert on Earth (13.8 million square kilometers). It is the coldest, windiest, and most isolated continent on Earth, and is considered a desert because its annual precipitation can be less than 51 mm.
Only 2% of Antarctica isn’t covered by ice, and this land is strictly along the coasts, where all the life that is associated with the land mass (i.e. penguins, seals and various species of birds) reside.
The other 98% of Antarctica is covered by ice which averages 1.6 km in thickness.
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642. What is adjustable gastric band?

A laparoscopic adjustable gastric band, commonly called a lap-band, A band, or LAGB, is an inflatable silicone device placed around the top portion of the stomach to treat obesity, intended to slow consumption of food and thus reduce the amount of food consumed.
Gastric banding leads to loss of about 35% to 45% of excess weight. For example, someone who is 100 pounds overweight might expect to lose about 35 to 45 pounds after gastric banding. However, these results vary widely. Gastric banding is considered the least invasive weight loss surgery and also the safest. The procedure can be reversed if necessary, and in time, the stomach generally returns to its normal size.
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643. Do rabbits really love carrots that much?

Despite popular beliefs and famous cartoons depicting it, exclusively feeding bunnies with carrots may pose health problem for them, even leading to premature death.
Rabbits don't naturally eat root vegetables/fruit. Carrots and fruit are high in sugar and should only be fed in small amounts as occasional treats.
Rabbits need mainly hay and/or grass, some leafy greens and a small, measured amount of pellets.
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644. What does going public mean?

Going public refers to a private company's initial public offering (IPO), thus becoming a publicly traded and owned entity. Businesses usually go public to raise capital in hopes of expanding; venture capitalists may use IPOs as an exit strategy - that is, a way of getting out of their investment in a company.
The IPO process begins with contacting an investment bank and making certain decisions, such as the number and price of the shares that will be issued. Investment banks take on the task of underwriting, or becoming owners of the shares and assuming legal responsibility for them. The goal of the underwriter is to sell the shares to the public for more than what was paid to the original owners of the company. Deals between investment banks and issuing companies can be valued at hundreds of millions of dollars, some even hitting $1 billion.
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645. What is hard water and soft water?

Hard water is water that contains an appreciable quantity of dissolved minerals (like calcium and magnesium). Soft water is treated water in which the only ion is sodium. As rain water falls, it is naturally soft. On the other hand, soft water tastes salty and is sometimes not suitable for drinking.
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646. What is NMR Spectroscopy?

Nuclear magnetic resonance spectroscopy, most commonly known as NMR spectroscopyor magnetic resonance spectroscopy (MRS), is a research technique that exploits the magnetic properties of certain atomic nuclei. This type of spectroscopy determines the physical and chemical properties of atoms or the molecules in which they are contained. It relies on the phenomenon of nuclear magnetic resonance and can provide detailed information about the structure, dynamics, reaction state, and chemical environment of molecules. The intramolecular magnetic field around an atom in a molecule changes the resonance frequency, thus giving access to details of the electronic structure of a molecule and its individual functional groups.
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647. Why is an Atlas called so?

The mythological creature Atlas is often associated, and pictured, on atlases. Atlas was a giant (called a Titan) who was forced to carry the Earth and the heavens (usually pictured as a sphere) on his back. An atlas is a book or collection of maps. They depended on atlases to guide them through unfamiliar territory.
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648. What is RO system?

A Simple and Straight forward Water Filtration Process. Reverse Osmosis is a process in which dissolved inorganic solids (such as salts) are removed from a solution (such as water). This is accomplished by household water pressure pushing the tap water through a semi-permeable membrane.
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649. Why do we have Toes?

Our toes do two important things for us:
Firstly, the toes, especially the big toe, help us balance. The second thing toes do for us is to help propel us forward while we are walking or running. The toes give the last little push off.
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​​650. What is Abacus?

The abacus , also called a counting frame , is a calculating tool used primarily in parts of Asia for performing arithmetic processes. Today, abaci are often constructed as a
bamboo frame with beads sliding on wires, but originally they were beans or stones
moved in grooves in sand or on tablets of wood, stone, or metal. The abacus was in use centuries before the adoption of the written modern numeral system and is still widely used by merchants, traders and clerks in Asia , Africa , and elsewhere. The user of an abacus is called an abacist.
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651. What is history of Olympic Rings?

http://telegra.ph/What-is-history-of-Olympic-Rings-11-28
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652. What is the reason behind colourful vegetables?

Many vegetables and fruits are strongly coloured because they contain a special kind of chemical compound named carotenoids. These compounds have an area called choromophore, which absorbs and gives off particular wavelengths of light, generating the colour that we then perceive.
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653. What is Hawk-Eyes Technology?

Hawk-Eye is a complex computer system used officially in numerous sports such as cricket, tennis, Gaelic football, badminton, hurling, Rugby Union, association football and volleyball, to visually track the trajectory of the ball and display a record of its statistically most likely path as a moving image.
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654. What is Face ID?

Face ID is a facial recognition system, designed and released by Apple Inc. and is included in the iPhone X . It was introduced on September 12, 2017 at the Steve Jobs Theater by Phil Schiller and Craig Federighi. It is meant to replace Touch ID rather than to add another security mechanism. It allows users to unlock iPhone X, make purchases in the various Apple digital media stores (the iTunes Store, the App Store, and the iBooks Store), and authenticate Apple Pay online or in apps.
Face ID works by projecting more than 30,000 infrared dots onto a face and producing a 3D facial map. Apple claimed the probability of someone else unlocking a phone is 1 in 1,000,000 as opposed to Touch ID at 1 in 50,000. If the user's phone has been rebooted, has not been unlocked for 48 hours, or disabled by the user by activating "Emergency SOS",
only the passcode can be used to unlock the device and not their face.
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​​655. What is MCB and what is it used for?

A miniature circuit breaker is used in new constructions instead of the older types of fuses. Circuit breakers are small devices used to control and protect the electrical panel and the other devices from overflowing of electrical power. They are used to maintain and ensure safety and quality of the energy provided.
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656. What is Eye-Gaze Technology?

Eye-gaze control technology allows children and adults with cerebral palsy to use movements of their eyes to operate a laptop, computer or speech-generating device.
This technology can be used for many purposes, including playing games, accessing the internet and communicating with family and friends.
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657. Why did Pisa tower lean?

The Leaning Tower of Pisa is a freestanding bell tower located in the city of Pisa in Italy. Like its name suggest, it actually does lean to one side. The tower started to lean during construction because the foundation was built on soft ground that had difficulty supporting the weight.
It had begun to lean by the time its builders got to the third story, in 1178. Shifting soil had destabilized the tower's foundations. It kept leaning more and more.
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658. What is Neural Tube defect?

Neural tube defects are birth defects of the brain, spine, or spinal cord. They happen in the first month of pregnancy, often before a woman even knows that she is pregnant. The two most common neural tube defects are spina bifida and anencephaly. In spina bifida, the fetal spinal column doesn't close completely. There is usually nerve damage that causes at least some paralysis of the legs. In anencephaly, most of the brain and skull do not develop. Babies with anencephaly are usually either stillborn or die shortly after birth. Another type of defect, Chiari malformation, causes the brain tissue to extend into the spinal canal.
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658. What is Neural Tube defect?

Neural tube defects are birth defects of the brain, spine, or spinal cord. They happen in the first month of pregnancy, often before a woman even knows that she is pregnant. The two most common neural tube defects are spina bifida and anencephaly. In spina bifida, the fetal spinal column doesn't close completely. There is usually nerve damage that causes at least some paralysis of the legs. In anencephaly, most of the brain and skull do not develop. Babies with anencephaly are usually either stillborn or die shortly after birth. Another type of defect, Chiari malformation, causes the brain tissue to extend into the spinal canal.
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659. What is Blue Brain Technology?

The Blue Brain, a Swiss national brain initiative, aims to create a digital reconstruction of the brain by reverse-engineering mammalian brain circuitry. The mission of the project, founded in May 2005 by the Brain and Mind Institute of the École Polytechnique Fédérale de Lausanne (EPFL) in Switzerland, is to use biologically-detailed digital reconstructions and simulations of the mammalian brain (brain simulation) to identify the fundamental principles of brain structure and function in health and disease.
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660. Why Do Medical Researchers Use Mice?

Medical researchers rely on mice and rats for several reasons:
- Convenience: rodents are small, easily maintained, and easy to adapt to new environment. They also reproduce quickly with short lifespan (two to three years), so several generations of mice can be observed in a relatively short period of time.
- Economical: Mice and Rats are relatively inexpensive and can be bought in large quantities.
- Genetically Identical: Most of the mice and rats used in medical trials are inbred so that, they are almost identical genetically. This helps make the results of medical trials more uniform.
- Similarity to Human: Many symptoms of human conditions can be replicated in mice and rats.
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661. Why Are Coins Round Instead Of Square Or Rectangle?

Actually, the first coins were rectangular bars of electrum( an alloy of gold and silver) punched with an round official symbol but accountants found round coins easier to stack and count. Also, round coins are easier to mint. A circular die simply needs to line up with the opposing circular blank to mint a coin successfully. Non-circular coins are more susceptible to wear and tear due to the corners than the circular ones.
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​​662. How Bluetooth logo was created?

The Bluetooth logo is the combination of “H” and “B,” the initials of Harald Bluetooth, written in the ancient letters used by Vikings, which are called “runes.”
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663. What is the use of haptic technology?

Haptic technology is also widely used in teleoperation, or telerobotics. In a telerobotic system, a human operator controls the movements of a robot that is located some distance away. Some teleoperated robots are limited to very simple tasks, such as aiming a camera and sending back visual images.
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664. Where Do Permanently Deleted Files Go in Computers?

the answer is your computer doesn’t delete anything, they are right there in your hard disk.
When you delete a file you just change a pointer to new address on your hard disk. Pointers are a special type of data that points to the location (Track/Cylinder/Sector of hard drive) where the actual file is stored. Large files are usually stored in multiple locations. When you open a file, the hard drive follows the pointer to present the data.
The file is never erased, it is present physically on your hard disk. But the address where file is located is made available for the next read/write operation.
You can get those files back using special software, unless the location has been overwritten. Although, overwriting doesn’t guarantee that your files are gone forever. So if you are working for any secret agency, it’s better to destroy your hard disk rather than throwing it away.
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665. Why is Venus hotter than Mercury if Mercury is closer to the sun?

Venus has a very dense atmosphere made up of carbon dioxide, nitrogen, and sulfuric acid, while Mercury has a very thin atmosphere with various gases, but very little carbon dioxide. Sunlight will pass through Venus' clouds (which contain mostly carbon dioxide) and warm the surface of the planet. Usually, the surface of a planet is warmed during the day and cools off at night by releasing infrared radiation (heat) back into space. But the carbon dioxide in Venus' clouds absorbs energy from infrared radiation very well and "traps" the heat on the planet, making it very warm. This has sometimes been called a "runaway greenhouse effect." This doesn't happen on Mercury because its atmosphere is not thick and does not have much carbon dioxide in it.
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​​666. How does a Magnetic stripe on the back of a Credit/Debit card work?

The ­stripe on the back of a credit card is a magnetic stripe, often called a magstripe. The magstripe is made up of tiny iron-based magnetic particles in a plastic-like film. Each particle is really a very tiny bar magnet about 20 millionths of an inch long.
The magstripe can be "written" because the tiny bar magnets can be magnetized in either a north or south pole direction. The magstripe on the back of the card is very similar to a piece of cassette tape fastened to the back of a card.
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​​667. What is the use of "buttons" on the top of disposable soft drink lids?

It's so when you have a bunch of drinks, you can tell which is which without tasting them. You'll notice that the buttons are only for drinks that are the same color as other drinks.
So the worker can push down the bump that says what you're ordering. Like if you had a diet coke, they'd push down the one that said diet under it.
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668. How is bullet-proof glass made?

It might be better to call it ‘bullet-resistant’ glass, because it resists penetration, although a series of bullets fired at the same place will eventually break through. It is usually made by sandwiching a layer of deformable polycarbonate plastic between glass layers. The bullet’s impact shatters the outer layer of glass, spreading the energy over a wide area so the plastic layer ‘gives’, but does not rupture.
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Who Invented?

👉🏽 Adding Machine, 1642. Inventor : Blaise Pascal (France) (1623-62). Earliest commercial machine invented by William Burroughs (U.S.) in St. Louis, Missouri in 1885.

👉🏽 Addressograph, 1893. Inventor : J.S. Duncan (U.S.). Manufactured in Chicago, Illinois.

👉🏽 Airplane, 1903. Inventors: Orville Wright (1871-1948) and Wilbur Wright (1867-1912), (U.S.) Kitty Hawk, North Carolina.

👉🏽 Airship (non-rigid), 1852. Inventor : Henri Giffard (France) (1825-82). Steam-powered propeller flew over Paris (1852).

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669. What is Silk Road?

From the second century BC to the end of the fourteenth century AD, a great trade route originated from Chang'an (now Xian) in the east and ended at the Mediterranean in the west, linking China with the Roman Empire. Because silk was the major trade product which traveled on this road, it was named the Silk Road in 1877 by Ferdinand von Richthofen – a well-known German geographer. This ancient route not only circulated goods, but also exchanged the splendid cultures of China, India, Persia, Arabia, Greek and Rome.
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Who Invented?

👉🏽 Airship (rigid), 1900. Inventor : Graf Ferdinand von Zeppelin (Germany) (1838- 1917). Bodensee.

👉🏽 Antiseptic, 1867. Inventor : Dr. Joseph Lister (England).

👉🏽 Arc Lamp, 1879. Inventor : C.F. Brush (U.S.) (1849-1929). Cleveland, Ohio.

👉🏽 Argon, 1894. Discoverers : Sir William Ramsay and Baron Ray Leigh (Great Britain).

👉🏽 Aspirin, 1899. Inventor : Dr. Felix Hoffman, Germany.

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​​670. What is TPU?

Tensor processing unit. A tensor processing unit (TPU) is an application-specific integrated circuit (ASIC) developed by Google specifically for machine learning. However, Google still uses CPUs and GPUs for other types of machine learning.
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​​671. What is the meaning of seven spikes on statue of Liberty?

It is just over 305 feet tall from the ground to the top of the torch flame. The crown has 25 windows and seven spikes. Spike That Fact! The seven spikes represent the seven seas and seven continents of the world, according to the Web sites of the National Park Service and the Statue of Liberty Club.
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Who Invented?

👉🏽 Atom Bomb, 1945. Inventor : Julius Robert Oppenheimer (U.S) (1904-1967).

👉🏽 Autogiro, 1923. Inventor : Juan de la Cierva (Spain) (1896-1963). Horizontal unpowered rotor.

👉🏽 Automobile (steam), c. 1769. Inventor : Nicolas Cugnot (France) (1725-1804). Three-wheeled military tractor. Oldest surviving is Italian Bordino (1854) in Turin.

👉🏽 Automobile (gasoline), 1855. Inventor : Karl Benz (Germany) (1844-1929). Earliest model by Father Ferdinand Verbiest (d. 1687) c. 1665 in China. Earliest internal combustion automobile built (1862-63) by Jean Joseph Etienne Lenior (1822-1900) (France). First run by Benz Motorwagon, Manneheim in November or December 1885. Patented in January 29,1886. First powered handcart with internal combustion engine was by Siegfried Marcus (Austria) (c. 1864).

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