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​​672. Why there is a hole in lollipop stick?

It's because if you simply place the candy on top of the stick, the extremely low amount of friction between the stick and the candy, could sometimes cause the candy to fall off if you're, err, too vigorous with your licks.
The hole behaves just like a hook. A small portion of the candy is actually inserted into the little space in there so that it holds on until the candy is sufficiently consumed. This allows the candy to stay in place until you're done with consuming the sugary goodness.
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Who Invented?

👉🏽 Bakelite, 1907. Inventor : Lwo H. Backcland (Belgium/U.S.) (1863-1944).

👉🏽 Balloon, 1783. Inventor : Jacques Montgolfier (1755-99) and Joseph Montgolfier (France) (1740-1810). Tethered flight, Paris (October 15); manned free flight, Paris.

👉🏽 Ballpoint Pen, 1888. Inventor : John J. Loud (U.S.). First practical models by Ladisloa and George Biro (Hungary) in 1938.

👉🏽 Barbed Wire, 1873. Inventor : Joseph F. Glidden (U.S.); manufactured at De Kalb, Illinois.

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673. Do You Know Why That Extra Scrap Of Cloth Is Included In New Clothes?

No, It's not to sew torn patches up, like I used to think earlier.
Well, they are given so that you can know the nature of the textile material used, so that you don't wash it in a way that can potentially ruin your entire dress. You can check it by washing the sample using a washing powder or bleach to know if it'll shrink or colour bleed.
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Who Invented?

👉🏽 Bicycle Tyres (Pneumatic), 1888. Inventor : John Boyd Dunlop (Scotland) (1840-1921). Principle patented but undeveloped by Orbert William Thomson (Scotland), June 10 1885. First motor car pneumatic tyres adapted by Andre and Edouard Michelin (France), 1885 (see rubber tyres).

👉🏽 Bifocal Lens, 1780. Inventor : Benjamin Franklin (1706-90) (U.S.). His earliest experiments began c. 1760.

👉🏽 Bullet, 1849. Inventor : Claude Minie (France).

👉🏽 Bunsen Burner, 1858. Inventor : Robert Wilhelm von Bunsen (Germany) (1811-99). Michael Faraday (1791-1867) (England) had previously designed an adjustable burner.

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​​674. Why do ballpoint pen caps have holes?

The pen caps have holes in them to prevent suffocation, in case they were swallowed. One of the oldest and more popular ballpoints were the Bic Cristal who originally made it part of their design to include a small hole at the end of the cap.
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Who Invented?

👉🏽 Burglar Alarm, 1851. Inventor : Edwin T. Holmes (U.S.). Electric installed, Boston Massachusetts (February 21).

👉🏽 Cadmium, 1817. Discovered : Friedrich Stromeyer (Germany).

👉🏽 Cannon (iron), c. 1320. Inventor : Germany. Earliest English illustration dated 1326.

👉🏽 Carburettor, 1876. Inventor : Gottlieb Daimler (Germany) (1834-1900). Carburettor spray; Charles E. Duryea (U.S.) 1892.

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675. How do wireless swiping machines work? What is the working principle?

This type of machines work with GPRS data networks provided by a mobile service provider with the help of a GSM SIM. This is very similar to a wired swiping machine except that the internet connection to the device is established with wireless GPRS data. The firmware program installed in the device will transfer the data from the swiped Card (Card-owner’s name, card-number and expiry date of the card) to the merchant’s bank for payment process. A response message will be received by the device from the merchant’s bank depending on the result of this processing (transaction completed, failed etc).
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Who Invented?

👉🏽 Carpet Sweeper, 1876. Inventor : Melville R. Bissell (U.S.). Grand Rapids, March. (Patent, September 19).

👉🏽 Car Radio, 1929. Inventors : William Lear and Elmer Wavering (USA).

👉🏽 Cash Register, 1879. Inventor : James Ritty (U.S.). Built in Dayton, Ohio. Taken over by National Cash Register Co. in 1884.

👉🏽 Cellophane, 1900. Inventor : I.E. Brandenberger (Switzerland). Machine production not before 1911.

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​​676. What That Arrow on Your Gas Gauge Really Means?

Have you ever noticed a tiny arrow next to the fuel pump icon on your car's gas gauge? Well, if you have, but were never really quite sure what it meant, we're here let you in on a little secret.
That little arrow tells you which side of your car the fuel cap is located on.
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677. What is Tizen operating system?

Tizen is a Linux-based operating system whose development is guided by the Technical Steering Group, which is an organisation that includes both Samsung and Intel.
In 2013 Samsung merged it’s Bada project into Tizen and a base program was developed upon which sits device specific operating systems such as Tizen Mobile and Tizen Wearable.
So far Samsung has launched a smart camera and the Gear 2 smartwatch whilst Systena has launched a 10 inch tablet, all running on Tizen.
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678. Why Blood is Red?

Each hemoglobin protein is made up sub units called hemes, which are what give blood its Red color. More specifically, the Hemes can bind iron molecules, and these iron molecules bind oxygen. The blood cells are red because of the interaction between Iron and oxygen.
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679. What is the Nuclear Suppliers Group?

Nuclear Suppliers Group (NSG) is a group of nuclear supplier countries that seek to prevent nuclear proliferation by controlling the export of materials, equipment and technology that can be used to manufacture nuclear weapons.
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Who Invented?

👉🏽 Celluloid, 1861. Inventor : Alexander Parkes (England) (1813-90). Invented in Birmingham, England; developed and trade marked by I.W. Hyatt (U.S.) in 1873.

👉🏽 Cement, 1824. Inventor : Joseph Aspdin (England).

👉🏽 Chain Drive, 1491-93. Inventor : Leonardo da Vinci (1452-1519). Drawings made in Milan (Italy) were discovered in Spain in 1967.

👉🏽 Chlorine, 1774. Discoverer : Karl Wilhelm Scheele (Sweden).

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​​680. What is the purpose of the Num Lock key?

It is just used to lock and unlock the separate numeric keypad on your keyboard. Turning the Num Lock on will allow the user to use the numbers on the keypad and turning the Num Lock off will enable the keys other functions such as using the keypad as an arrow pad.
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​​681. What are Light Pillars?

Light pillars, sometimes also called sun pillars or solar pillars, occur when light from any source reflects off ice crystals in the air. The result is shafts of light illuminating the sky that put lightning to shame. That almost makes braving the sub-zero temperatures of Minnesota worth it.
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Who Invented?

👉🏽 Chronometer, 1735. Inventor : John Harrison (England) (1693-1776). Received in 1772 Government £ 20,000 prize.

👉🏽 Cinema, 1895. Inventors: Auguste Marie Louis Nocolas Lumicre (1862-1954) and Louis Jean Lumiere (France) (1864-1948). Development pioneers were Etienne Jules Marcy (France) (1830-1903) and Thomas A. Edison (U.S.) (1847-1931). First public showing, Paris (December 28, 1895)

👉🏽 Classification of Data for Libraries. Inventor : Melvil Dewey (U.S.) (1851-1913). Introduced his decimal classification in 1876.

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682. What is GSM in papers?

The term GSM refers to the substance weight of paper, relating to an area ofpaper that remains constant, irrespective of sheet size, expressed as grams per square metre. As a starting point, standard printer paper is generally around 80gsm.
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​​683. How long does it take for food to pass through the digestive system?

Digestion time varies between individuals and between men and women. After you eat, it takes about six to eight hours for food to pass through your stomach and small intestine. Food then enters your large intestine (colon) for further digestion, absorption of water and, finally, elimination of undigested food.
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​​684. What does the color strip on the bottom of toothpaste mean?

The squares are actually just part of the manufacturing process, and are called “eye marks.”
The hidden information in these coloured squares are read by light beam sensors and literally just tell the high-speed machinery where the packaging needs to be cut and folded.
Different colour squares for different colours of tube.
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​​684. What does the color strip on the bottom of toothpaste mean?

The squares are actually just part of the manufacturing process, and are called “eye marks.”
The hidden information in these coloured squares are read by light beam sensors and literally just tell the high-speed machinery where the packaging needs to be cut and folded.
Different colour squares for different colours of tube.
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685. Why Do We Say "Merry Christmas" Instead of "Happy Christmas"?

As December 25th approaches, we've found ourselves saying "Merry Christmas" to everyone. But have you ever stopped to wonder where the phrase "Merry Christmas" comes from? In a world where it's normal to say "Happy Easter" and "Happy Birthday," the "merry" in "Merry Christmas" is unique. The answer goes back to the connotation of the two words. "Happy" is an emotional condition, while "merry" is a behavior.
Furthermore, happy, which came from the word "hap," meaning luck or chance implies good-fortune. Meanwhile, "merry" implies a more active showing of happiness—which you might think of as merry-making.
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686. Why do we need sleep?

We tend to think of sleep as a time when the mind and body shut down. But this is not the case; sleep is an active period in which a lot of important processing, restoration, and strengthening occurs. Exactly how this happens and why our bodies are programmed for such a long period of slumber is still somewhat of a mystery. But scientists do understand some of sleep's critical functions, and the reasons we need it for optimal health and wellbeing.
One of the vital roles of sleep is to help us solidify and consolidate memories. As we go about our day, our brains take in an incredible amount of information. Rather than being directly logged and recorded, however, these facts and experiences first need to be processed and stored; and many of these steps happen while we sleep. Overnight, bits and pieces of information are transferred from more tentative, short-term memory to stronger, long-term memory—a process called "consolidation." Researchers have also shown that after people sleep, they tend to retain information and perform better on memory tasks. Our bodies all require long periods of sleep in order to restore and rejuvenate, to grow muscle, repair tissue, and synthesize hormones.
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​​687. What is FireWhirls?

A fire whirl, also known as fire devil or fire tornado, is a rare phenomenon in which a fire, under certain conditions –depending on air temperature and currents–, acquires a vertical vorticity and forms a whirl, or a tornado-like effect of a vertically oriented rotating column of air. Fire whirls often occur during bush fires. Vertical rotating columns of fire form when the air currents and temperature are just right, creating a tornado-like effect. They can be as high as 30 to 200 ft tall and up to 10 ft wide but only last a few minutes, although some can last for longer if the winds are strong.
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​​688. What Is the Purpose of the “Do Not Cover This Hole” Hole on Hard Drives?

Hard disk drives require a certain range of air pressures in order to operate properly. The connection to the external environment and pressure occurs through a small hole in the enclosure (about 0.5 mm in breadth), usually with a filter on the inside (the breather filter). If the air pressure is too low, then there is not enough lift for the flying head, so the head gets too close to the disk, and there is a risk of head crashes and data loss. Specially manufactured sealed and pressurized disks are needed for reliable high-altitude operation, above about 3,000 m (9,800 ft).99 Modern disks include temperature sensors and adjust their operation to the operating environment. Breather holes can be seen on all disk drives—they usually have a sticker next to them, warning the user not to cover the holes.
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Who Invented?

👉🏽 Clock (mechanical), 725. Inventors: I-Hsing and Liang Ling-Tsan (China). Earliest escapement 600 years before Europe.

👉🏽 Clock (pendulum), 1657. Inventor : Christian Huygens (Netherlands) (1629-92).

👉🏽 Dacron, 1941. Inventors: J.R. Whinfield (1901-66), J.T. Dickson (England). First available 1950, marketed in U.S.

👉🏽 Dental Plate, 1817. Inventor : Anthony A. Plantson (U.S.) (1774-1837).

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689. Why Doctor Rub Someone's Arm before Injecting a Syringe?

It's isopropyl alcohol applied with some sort of cotton swab. They do this to kill any germs that might be on your skin and could infect the injection site.
When injecting into a vein, rubbing or patting stimulates blood flow to that area and makes the vessels consequently larger and easier to spot as they expand and bulge against the skin.
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Who Invented?

👉🏽 Dental Plate (rubber), 1855. Inventor : Charles Goodyear (U.S) (1845-1921).

👉🏽 Diesel Engine, 1895. Inventor : Rudolf Diesel (Germany) (1858-1913). Lower pressure oil engine patent by Stuart Akroyd, 1890. Diesel's first commercial success, Augsberg, 1897.

👉🏽 Disc Brake, 1902. Inventor : Dr. F. Lanchester (England). First used on aircraft 1953 (Dunlop Rubber Co.).

👉🏽 Electric Battery, 1800. Inventor : Volta (Italian)

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​​690. What is Mammatus Clouds?

Mammatus are pouch-like cloud structures and a rare example of clouds in sinking air. Sometimes very ominous in appearance, mammatus clouds are harmless and do not mean that a tornado is about to form; a commonly held misconception. In fact, mammatus are usually seen after the worst of a thunderstorm has passed.
Although mammatus most frequently form on the underside of a cumulonimbus, they can develop underneath cirrocumulus, altostratus, altocumulus and stratocumulus. For a mammatus to form, the sinking air must be cooler than the air around it and have high liquid water or ice content.
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691. What is Vertigo?

Vertigo is a sensation of feeling off balance. If you have these dizzy spells, you might feel like you are spinning or that the world around you is spinning.
Causes of Vertigo:
Vertigo is often caused by an inner ear problem. Some of the most common causes include:
BPPV- These initials stand for benign paroxysmal positional vertigo. BPPV occurs when tiny calcium particles (canaliths) clump up in canals of the inner ear. The inner ear sends signals to the brainabout head and body movements relative to gravity. It helps you keep your balance.
BPPV can occur for no known reason and may be associated with age.
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Who Invented?

👉🏽 Electric Blanket; 1946. Inventor : Simmons Co., Petersburg, Virginia, U.S. Thermostatic control.

👉🏽 Electric Cooking Utensil, 1874. Inventor : St. George Lane-Fox (England).

👉🏽 Electric Fan, 1882. Inventor : Wheeler (USA). Electric Flat Iron, 1882. Inventor : H.W. Seeley (U.S.), New York City.

👉🏽 Electric Generation (Static), 1660. Inventor : Otto von Gueriche (Germany).

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692. What is thermoregulation and hypothermia?

Thermoregulation is the ability of an organism to keep its body temperature within certain boundaries, even when the surrounding temperature is very different. A thermoconforming organism, by contrast, simply adopts the surrounding temperature as its own body temperature, thus avoiding the need for internal thermoregulation. The internal thermoregulation process is one aspect of homeostasis: a state of dynamic stability in an organism's internal conditions, maintained far from thermal equilibrium with its environment (the study of such processes in zoology has been called physiological ecology). If the body is unable to maintain a normal temperature and it increases significantly above normal, a condition known as hyperthermia occurs. For humans, this occurs when the body is exposed to constant temperatures of approximately 55 °C (131 °F), and with prolonged exposure (longer than a few hours) at this temperature and up to around 75 °C (167 °F) death is almost inevitable. Humans may also experience lethal hyperthermia when the wet bulb temperature is sustained above 35 °C (95 °F) for six hours. The opposite condition, when body temperature decreases below normal levels, is known as hypothermia.
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Who Invented?

👉🏽 Electric Lamp, 1879. Inventor : Thomas Alva Edison (U.S.) (1847-1931). First practical demonstration at Menlo Park, New Jersey.

👉🏽 Electric Motor (DC), 1873. Inventor : Zenobe Gramme (Belgium) (1826-1901). Exhibited in Vienna.

👉🏽 Electric Motor (AC), 1888. Inventor : Nikola Tesla (U.S.) (1856-1943).

👉🏽 Electromagnet, 1824. Inventor : William Sturgeon (England) (b. 1783); improved by Joseph Henry (U.S.) 1831.

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​​693. What is Red Tide?

More correctly known as an algal bloom, the so-called Red tide is a natural event in which estuarine, marine, or fresh water algae accumulate rapidly in the water column and can convert entire areas of an ocean or beach into a blood red color. This phenomena is caused by high levels of phytoplankton accumulating to form dense, visible clouds near the surface of the water. While some of these can be relatively harmless, others can be harbingers of deadly toxins that cause the deaths of fish, birds and marine mammals. In some cases, even humans have been harmed by red tides though no human exposure are known to have been fatal. While they can be fatal, the constituent phytoplankton in ride tides are not harmful in small numbers.
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694. How do you keep warm in an igloo?

The principle behind an igloo is hidden in the material it's constructed out of. Igloos are normally built from compressed snow, which is sawn into blocks, and then these blocks are stacked around a hole, which is dug out after the blocks have been set. Solid ice is a poor insulator, when compared to compressed snow. The snow has many many more air pockets per cubic foot, and is also lighter. Also, igloos do not have flat bottoms. The inside of the igloo is tiered, or terraced, the uppermost level being where the people sleep, the middle is where the fire is and the work takes place, and the bottom level actually is a "cold sump". The principle is that all the coldest air from inside the igloo runs downward off the terraces and collects in the bottom, thus allowing the upper portions to stay warmer.
The entrance for the igloo is usually at the bottom, and includes at least one right angle, which keeps the high winds from blowing straight into the igloo and chilling the residents or blowing out the fire. They also all have a small hole on the top that keeps the smoke from building up inside the igloo. All of these factors take advantage of underlying physics, and the temperature inside an igloo is likely to be 20 degrees or so, while the outside temperature in northern regions can drop down to -50 degree Fahrenheit during the daytime. 20 degrees may not be what some consider to be comfortable, but a 70 degree difference is certainly welcome somewhere so cold.
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695. What is OK short for?

The most popular theory is that OK comes from ‘oll korrect’, a deliberately misspelled writing of ‘all correct’. It was popularised in Boston newspapers around the 1840s when it was fashionable to go around spelling things incorrectly for humorous effect. Legend also has it that New York Democrats later adopted the abbreviation to promote their candidate Martin Van Buren – the initials ‘OK’ were derived from his nickname, Old Kinderhook.
It has been described as the most frequently spoken or written word on the planet.
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Who Invented?

👉🏽 Electromagnetic Induction, 1831. Inventor : Michael Faraday (Great Britain); discovered previously, but not published, by Joseph Henry (United States).

👉🏽 Electronic Computer, 1942. Inventor : J.G. Brainerd, J.P. Eckert, J.W. Mauchly (U.S.). ENIAC (Electronic Numerical Integrator and Circulator), University of Pennsylvania, Philadelphia.

👉🏽 Elevator, 1852. Inventor : Elisha G. Otis (U.S.) (1811-61). Earliest elevator at Yonkers, N.Y.

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696. What are different part of a Shirt?

http://telegra.ph/What-are-different-part-of-a-Shirt-12-09
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​​697. What is Penitentes?

These amazing ice spikes, generally known as penitentes due to their resemblance to processions of white-hooded monks, can be found on mountain glaciers and vary in size dramatically: from a few centimetres to 5 metres in height. Initially, the sun’s rays cause random dimples on the surface of the snow. Once such a dimple is formed, sunlight can be reflected within the dimple, increasing the localized sublimation. As this accelerates, deep troughs are formed, leaving peaks of ice standing between them.
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Who Invented?

👉🏽 Film (musical), 1923. Inventor : Dr. Lee de Forest (U.S.) New York demonstration (March 13).

👉🏽 Film (talking), 1926. Inventor : Warner Bros. (U.S.). First release Don Juan, Warner Theatre, New York (August 5).

👉🏽 Fluroine, 1886. Discoverer : Ferdinand Frederick Henri Moissan (France).

👉🏽 Food Frozen, 1923. Inventor : Birdseyes (USA).

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698. What is Iris scanning used for?

Iris scanning technology is a security measure used to identify individuals with respect to high-security applications, such as government buildings, airports, computer access, ultra-secure locations and cellphone access. Hospitals use iris scanning technology to pair mothers with infants in maternity wards. Border crossing agents match the identities of people on government watch lists with iris scans.
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Who Invented?

👉🏽 Fountain Pen, 1884. Inventor : Lewis E. Waterman (U.S.) (1837-1901). Patented by D. Hyde (U.S.), 1830, undeveloped.

👉🏽 Gas Lighting, 1792. Inventor : William Murdock (Scotland), (1754-1839). Private house in Cornwall, 1792; Factory, Birmingham, 1798; London Street, 1807.

👉🏽 Generator, 1860. Inventor : Piciontti (Italian). Continuous current: improved by Gramme (Belgium) 1870.

👉🏽 Glass (stained), c. 1080. Inventor : Augsberg (Germany). Earliest English, c. 1170, York Minister.

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​​699. What is Sailing Stones?

The mysterious moving stones of the packed-mud desert of Death Valley have been a center of scientific controversy for decades. Rocks weighing up to hundreds of pounds have been known to move up to hundreds of yards at a time. Some scientists have proposed that a combination of strong winds and surface ice account for these movements. However, this theory does not explain evidence of different rocks starting side by side and moving at different rates and in disparate directions. Moreover, the physics calculations do not fully support this theory as wind speeds of hundreds of miles per hour would be needed to move some of the stones.
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Who Invented?

👉🏽 Glassware, c. 1500 BC. Inventor : Egypt and Mesopotamia (Today's Iraq). Glass blowing, Syria, c. 50 BC.

👉🏽 Glider, 1853. Inventor : Sir George Cayley (England) (1773-1857). Near Brompton Hall, Yorkshire, England. Passenger possibly John Appleby.

👉🏽 Gramophone, 1878. Inventor : Thomas Edison (USA).

👉🏽 Gyro-Compass, 1911. Inventor : Elmer A. Sperry (U.S.) (1860-1930). Tested on USS Delaware (August 28). Gyroscope devised 1882 by Foucault (France).

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700. What is the True Purpose of Solitaire, Minesweeper, and FreeCell | Mental games in Microsoft OS?

Microsoft Solitaire debuted in Windows in 1990 when the software giant rolled out version 3.0 of the operating system, and it was the first widely-popular digital version of the card game (although it actually existed since the 1700s, but in traditional form).
And as it turns out, Microsoft had one very clear goal in mind when bringing Solitaire in Windows: to teach Windows adopters how to use the mouse and drag and drop features. As weird as it may sound, at that point, the mouse was still an unexplored world for most computer users, mostly because the majority were used with the traditional command line.
So Solitaire was there to make the whole mouse thing a familiar experience, and judging from where the mouse is right now, Microsoft’s plan was kind of successful.
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701. Why Do Antiseptics Sting When Put on Cuts?

The answer has to do with ethanol and hydrogen peroxide, which are often ingredients in antiseptics. Both of these agents activate receptors in the body that trigger a burning sensation.
Ethanol activates the vanilloid receptor-1, known by the nickname VR1, according to a 2002 study in the journal Nature Neuroscience. VRI is responsible for creating a burning sensation when it's exposed to heat or certain chemicals, such as capsaicin in hot peppers.
VR1 is typically activated only at high temperatures, about 107 degrees Fahrenheit (42 degrees Celsius) or higher. "Usually it's not turned on unless you're actually getting burned,".
However, when ethanol comes into contact with the receptor, it lowers the temperature threshold to below body temperature. "So, all of a sudden, you feel like you're getting burned, even though you're not getting burned,".
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​​702. What is Supercells?

Supercell is the name given to a continuously rotating updraft deep within a severe thunderstorm (a mesocyclone) and looks downright scary. They are usually isolated storms, which can last for hours, and sometimes can split in two, with one storm going to the left of the wind and one to the right. They can spout huge amounts of hail, rain and wind and are often responsible for tornados, though they can also occur without tornados. Supercells are often carriers of giant hailstones and although they can occur anywhere in the world they’re most frequent in the Great Plains of the US.
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703. Why does pepper make you sneeze?

A sneeze is a reflex that is triggered when nerve endings inside the mucous membrane of the nose are stimulated.
Pepper, be it white, black, or green, contains an alkaloid of pyridine called piperine. Piperine acts as an irritant if it gets into the nose. It stimulates (or irritates) the nerve endings inside the mucous membrane. This stimulation will cause you to sneeze. Actually, the nose wants to kick out this irritant and the only way it knows how to do this is by sneezing.
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704. Why do houseflies rub their front legs together?

Housefly (Musca Domestica) is a common insect found in all places. It has a very short life span. Adult houseflies feed on human and animal food and waste materials and often use buildings as shelter.
The housefly is well adapted in structure and behaviour to transmit disease causing organisms from place to place.
The body of a housefly is covered with fine hairs and bristles that readily pick up filth particles.
At the base of each leg there is a cushion-like structure covered with granular hairs.A sticky secretion which excretes from the granular hairs gathers bacteria and other micro organisms which stick to the legs. In order to clean its body and the legs, houseflies rub their legs together. It is estimated that whenever a housefly rubs its legs, lakhs of bacteria are discharged from the legs for each rubbing.
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Who Invented?

👉🏽 Helicopter, 1930. Inventor : d' Ascanio (Italy). Co-axial machine. Earliest drawing of principle, Le Mans Museum, France, c. 1460. First serviceable machine by Igor Sikorsky (U.S.). 1939.

👉🏽 Helium, 1868. Discoverer : Sir William Ramsay (Great Britain).

👉🏽 Hovercraft, 1955. Inventor : C.S. Cockerell (England). Patented December 12. Earliest air-cushion vehicle patent was in 1877 by J.I. Thornycroft (1843-1921) (England). First 'light' Saunders Roe SRNI at. Cowes, England, (May 30, 1959).

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705. Why do our eyelashes and eyebrows never continue to gow unlike hair on our head?

☞ The cilia or eyelashes are hairs situated on the margin of the lids. They are dispensed in two rows, totalling about 100-150 cilia in the upper lid and half the number in the lower lid.
The pigmentation of the cilia is deeper than that of the scalp hair throughout adult life.
The average life of each cilium is from 3-5 months after which it falls out and a new one grows in to take its place. If the cilia is pulled out the new one replacing it reaches full size in about 2 months. Since the life of the cilia is only 3-5 months, it does not grow as long as scalp hairs.

☞ Small organs in the skin, called follicles produce hair. All follicles go through a three-stage cycle- anagen is a period when the hair grows actively; catagen is marked by a short phase during which growth winds down; and finally telogen is the stage of rest. The cycle is completed at the end of telogen and the hair falls and a new hair begins to grow.
Scalp hairs (hairs on the head) have the longest anagen period - four to eight years during which they grow and have just two to four months of rest stage.
Eyelashes, arm hair, and most other hairs on the body have significantly shorter growth periods of one to six months, followed by a 2-4 month period of rest.
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Who Invented?

👉🏽 Iron Working, c. 1000 BC. Inventor : Hallstatt, Austria. Introduced into Britain c. 550 BC.

👉🏽 Jet Engine, 1937. Inventor : Sir Frank Whittle (England) (b. 1906). First tested run in 1937. Principles announced by Merconnet (France) 1909 and Maxime Guillaume (France) 1921. First flight August 27, 1939 by Heinkel He.

👉🏽 Laser, 1960. Inventor : Dr. Charles H. Townes (U.S.). First demonstration by Theodore Maiman (U.S.). (Abbreviation for Light Amplification by Stimulated Emission of Radiation).

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706. What Makes Plants Grow up and Roots Grow Down?

Geotropism is the influence of gravity on plant growth or movement. Simply put, this means that roots grow down and stems grow up. Geotropism comes from two words, “geo” which means earth or ground and “tropism” which means a plant movement triggered by a stimulus. In this case, the stimulus is gravity. Upward growth of plant parts, against gravity, is called negative geotropism, and downward growth of roots is called positive geotropism.
In plant roots, the very end of the root is called the root cap. It makes the roots turn downward as they grow. The root cap is vital for geotropism since it contains cells with sensors called statoliths. Statoliths are specialized parts of the root cell that settle to the lowest part of the root cap in response to the pull of gravity. This makes the cell expand faster in a downward direction.
A similar mechanism is known to occur in plant stems except that the stem cells are programed to elongate upward, the exact opposite of the cells in the roots.
This upward and downward growth will continue even if the plant is turned sideways or upside down. 
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Who Invented?

👉🏽 Machine Gun, 1861. Inventor : Richard Gaffing (U.S.) (1818-1903).

👉🏽 Maps, c. 2500 BC. Inventor : Sumerians (clay tablets). Earliest world map by Eratosthenes c. 220 BC.

👉🏽 Margarine, 1863. Inventor : Hippolyte Mege-Mouries (France). Initially, made of beef suet, warm milk and sheep stomach lining.

👉🏽 Match (Safety), 1855. Inventor : J.E. Lundstrom (Sweden). Amorphous phosphorus disc, 1845, Anton von Schrotter.

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​​707. What is Ice Circles?

A rare phenomenon usually only seen in extremely cold countries, scientists generally accept that Ice Circles are formed when surface ice gathers in the center of a body of water rather than the edges. A slow moving river current can create a slow turning eddy, which rotates, forming an ice disc. Very slowly the edges are ground down until a gap is formed between the eddy and the surrounding ice. These ice circles have been seen with diameters of over 500 feet and can also at times be found in clusters and groups at different sizes.
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​​707. What is Ice Circles?

A rare phenomenon usually only seen in extremely cold countries, scientists generally accept that Ice Circles are formed when surface ice gathers in the center of a body of water rather than the edges. A slow moving river current can create a slow turning eddy, which rotates, forming an ice disc. Very slowly the edges are ground down until a gap is formed between the eddy and the surrounding ice. These ice circles have been seen with diameters of over 500 feet and can also at times be found in clusters and groups at different sizes.
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Who Invented?

👉🏽 Microphone, 1876. Inventor : Alexander Graham Bell (U.S.) (1847-1922). Name coined 1878 by David Hughes.

👉🏽 Microscope, 1590. Inventor : Zacharis Janssen (Netherlands). Compound convex-concave lens.

👉🏽 Microscope (Electron), 1939. Inventor : Vladimir Kosme Sworykin (Russia, later U.S) (b. 1889), et al. Demonstrated Camden, New Jersey, 1940.

👉🏽 Molecular Hypothesis, 1811. Inventor : Amadeo Avogadro (Italy).

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708. What is Blood Doping?

Blood doping is the practice of boosting the number of red blood cells in the blood stream in order to enhance athletic performance. Because such blood cells carry oxygen from the lungs to the muscles, a higher concentration in the blood can improve an athlete's aerobic capacity and endurance.
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Who Invented?

👉🏽 Motorcycle, 1848. Inventor : Edward Butler (England). First exhibited 1885 by Daimler, earliest factory in Munich 1893.

👉🏽 Motor Scooter, 1919. Inventor : Greville Bradshaw (England).

👉🏽 Neon Lamp, 1915. Inventor : Georges Claude (France) (1871-1960). First installation in U.S. Cosmopolitan Theatre, July 1923.

👉🏽 Night Club, 1843. Inventor : Paris, France. First was Le Bai des Anglais, Paris.

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​​709. What is Rainbow Eucalyptus?

Hailing from the Philippines and Indonesia, the rainbow eucalyptus, also known as the rainbow gum, is probably the most colorful tree on Earth. Its striped look is caused by bark turning colors and peeling away as it ages.
The youngest bark is bright green because it contains chlorophyll (usually found in leaves), then turns first purple then red then brown as it gets older, loses chlorophyll, and picks up tannins (also found in wine).
In an ironic twist, huge amounts of rainbow eucalyptus wood pulp is turned into white paper every year.
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Who Invented?

👉🏽 Nineteenth Laws of Planetary Motion, 1609. Inventor : Johannes Kepler (Germany).

👉🏽 Nylon, 1937. Inventor : Dr. Wallace H. Carothers (U.S.) (1896-1937) at Du Pont Labs, Seaford Delaware, U.S. First stockings made about 1937. Bristle production, February 25, 1938. Yarn production, December 1939.

👉🏽 Oxygen, 1775. Discoverer : Antoine Laurent Lavoisier (France).

👉🏽 Ozone, 1839. Discoverer : Christian Schonbein (Germany).

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710. How magician burn money without actual burning?

A combustion reaction occurs between alcohol and oxygen, producing heat and light (energy) and carbon dioxide and water.
When the money is soaked an alcohol-water solution, the alcohol has a high vapor pressure and is mainly on the outside of the material (a bill is more like fabric than paper, which is nice, if you've ever accidentally washed one). When the money is lit, the alcohol is what actually burns. The temperature at which the alcohol burns is not high enough to evaporate the water, which has a high specific heat, so the bill remains wet and isn't able to catch fire on its own. After the alcohol has burned, the flame goes out, leaving a slightly damp dollar bill.
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Who Invented?

👉🏽 Paper, c. 150. Invented in China. Introduced to West via Yarkand, c. 750.

👉🏽 Parachute, 1797. Inventor : Andre Jacques Garnerin (France) (1769-1823). First descent from 2,230 ft over Paris. Earliest jump from aircraft March 1, 1912 by Capt A. Berry (U.S.) over St. Louis, Missouri.

👉🏽 Parchment, c. 1300 BC. Inventor : Egypt. Modern name from Pergamam, Asia Minor, c. 250 BC.

👉🏽 Parking Meter, 1935. Inventor : Corlton C. Magee (U.S.). Oklahoma City (July 16).

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711. Why do Elevators have Mirrors inside?

Turns out, back in the day, when elevators were relatively new, people stood in them, staring into nothingness with an exaggerated sense of time because they had nothing else to do. All they could think of was their very natural fear of falling from an elevator suspended mid-air with nothing by but cables. So, mirrors were installed in order to distract people and give them something to look at while they waited. The mirrors also gave the usually small space of an elevators a sense of depth, thereby reducing the feeling of claustrophobia that one might feel in such an enclosed space.
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Who Invented?

👉🏽 Phonograph, 1878. Inventor : Thomas Alva Edison (U.S.) (1847-1931). Head cranked cylinder at Menlo Park. J. J. Patent, February 19. First described on April 30, 1877, by Charles Cross (France) (1842-88).

👉🏽 Phosphorus, 1669. Discoverer : Hennig Brand (Germany).

👉🏽 Photography (on metal), 1826. Inventor : Joseph Nicéphore Niepce (France) (1765-1833). Sensitised pewter plate, 8 hrs exposure at Chalon-sur-Saone, France.

👉🏽 Photography (on paper), 1835. Inventor : W. H. Fox Talbot (England) (1807-77). Lacock Abbey, Wiltshire, England.

👉🏽 Photography (on film), 1888. Inventor : John Carbutt (U.S.). Kodak by George Eastman (U.S.) (1854-1932), August 1888.

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712. Why do Trucks carrying Explosives have a Metal chain Touching the Ground?

The trucks carrying explosives have a metal chain touching the ground ,True. This is all because of the charges produced by the friction which is generated by the tires moving. When the tires move they create certain amount of charges which are enough to blow up the explosive tank. The main motive is to do earthing so that the charges flow down in the earth and prevent the truck from getting blown up or you can also say preventing the explosives to blast. 
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713. Why do Animals Eat more Food in Winter than Summer?

Animals burn energy to maintain body heat. Therefore, they need to eat more food so they have something to burn to maintain heat when it's cold. Few wild land animals are fat, so they don't have stores of energy to draw on. (Cold water mammals use their fat as insulation.)
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714. Which gas is used to show Clouds or Artificial smoke in film or Drama?

Fog is created by pumping one of a variety of different glycol or glycol/water mixtures (referred to as fog fluid) into a heat exchanger (essentially a block of metal with a resistance heating element in it) and heating until the fluid vapourizes, creating a thick translucent or opaque cloud. Devices specifically manufactured for this purpose are referred to as a fog machines.
An obsolete method for creating theatrical fog on-stage (although the technique is still commonly used in motion) is to use a device known as a thermal fogger, initially designed for distributing pesticide, which aspirates a petroleum product (typically kerosene or propane), ignites the fuel, and then mixes in air and pesticide to create a dense fog. For theatrical purposes the pesticide is typically replaced with glycol, glycol/water mixtures, or water. This technique is similar to the smoke generators used by militaries to create smoke screens, and is generally only used outdoors due to the volume of fog produced and the petroleum fuel required.
Some use liquid Nitrogen.
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Who Invented?

👉🏽 Radar, 1922. Inventors : Dr. Allbert H. Taylor and Leo C. Young (U.S.). Radio reflection effect noted. First harnessed in 1935 by Sir Robert Watson-Watt (England) (b. 1892).

👉🏽 Radioactivity, 1896. Inventor : Antoine Bacqucrel (France).

👉🏽 Radio Telegraphy (over 1 km), 1895. Inventor : Lord Ernest Rutherford (British-New Zealand) (1871-1937). At Cambridge, England.

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715. Why does it Seem as if Big Vehicles "Attract" mine when I drive close to them?

It all has to do with velocities and pressure between the two vehicles. So, in principle, it has to do with Bernoulli.
The two vehicles drag air with them, so between them you will have an area of higher fluid velocity than the area to the left and right of each vehicle respectively. To explain more plainly, between the two vehicles you will have dragged air from the two of them while to the left and right of them you will have dragged air from only one of them. So you have higher fluid velocity between them.
So, by applying Bernoulli's principle you find that between them you have lower pressure (high speed) and outside of them you will have higher pressure (lower velocity), so they get pushed towards the area with lower pressure, which is closer to each other.
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Who Invented?

👉🏽 Rubber (vulcanised), 1841. Inventor : Charles Goodyear (U.S.) (1800-60).

👉🏽 Rubber (tyres), 1857. Inventor : Thomas Hancock (England) (1786-1865). Introduced solid rubber tyres for vehicles (1847) (see also bicycle).

👉🏽 Rubber (latex foam), 1928. Inventor : Dunlop Rubber Co. (England). Team led by E.A. Murphy at Fort Dunlop, Birmingham, England.

👉🏽 Safety Pin, 1849. Inventor : William Hunt (U.S.). First manufactured in New York City.

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​​716. What is Fire Bucket?

A fire bucket is a bucket filled with water or sand which is used to prevent or extinguish fires.
Typically, fire buckets are painted bright red and have the word fire stencilled on them. Often they have a convex, protruding bottom. The rounded bottom results in a strong, directed stream of water when the water is thrown at the fire. The rounded-bottom bucket is far more efficient in launching the water at the fire than a flat bottom bucket.
Fire buckets are often provided at petrol filling stations to absorb any small fuel spills.
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Who Invented?

👉🏽 Refrigerator, 1851. Inventor : James Harrison [Australian (1816-1893)j Bendigo. Australia, Brewery.

👉🏽 Revolver, 1835. Inventor : Samuel Colt (U.S.) (1814-62).

👉🏽 Rocket Engine, 1926. Inventor : Robert H. Goddard (USA), considered as father of modern rocket propulsion.

👉🏽 Rubber (waterproof), 1819. Inventor : Charles Macintosh (Scotland) (1766-1843). First experiments in Glasgow. Rubber introduced into Europe in 1736.

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717. Why Mars is called Red Planet?

Mars - the red planet. Mars is oftencalled the 'Red Planet' because it appears in the sky as an orange-redstar. The colour caused the ancient Greeks and Romans to name it after their god of war. Today, thanks to visiting spacecraft, we know that the planet's appearance is due to rust in the Martian rocks.
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​​718. What is History of this Windows Wallpaper?

Bliss is the name of the default computer wallpaper of Microsoft's Windows XPoperating system. It is an unedited photograph of a green hill and blue sky with clouds in the Los Carneros American Viticultural Area of Sonoma County, California, United States. Charles O'Rear originally sent it to Corbis in 1996, and Microsoft bought the rights to the picture in 2000.
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​​💻 Know About Company 💻

Name: McDonald's
Industry: Restaurant
Founded: May 15, 1940
Founders:  Richard and Maurice McDonald
Headquarters: Oak Brook, Illinois, U.S. (moving to Chicago in 2018)
Website: https://www.mcdonalds.com/us/en-us.html

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Who Invented?

👉🏽 Ship (steam), 1775. Inventor : J.C. Perier (France) (1742-1818). First trail on the Seine river, near Paris, France.

👉🏽 Ship (turbine), 1894. Inventor : Hon. Sir Charles Parsons (England) (1854-1931). S.S. Turbinia attained 34.5 knots on first trial.

👉🏽 Silicones, 1904. Inventor : Prof. F.S. Kipping (England).

👉🏽 Silk Manufacture, c. 50 BC. Inventor : Reeling machines devised, China. Silk mills in Italy, c. 1250, world's earliest factories of any kind.

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719. What is “Freezer Burn''?

When food is frozen as a method of preservation, thousands and thousands of water molecules within the steak form ice crystals. These water molecules prefer the most hospitable environment- the coldest place in your freezer. The molecules migrate from the steak to the coldest place they can find, which is often the side of your freezer. The loss of these water molecules causes the steak to become dehydrated. The end result is freezer burn.
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​​​​💻 Know About Company 💻

Name: Walt Disney
Industry: Mass Media Entertainment
Founded: October 16, 1923
Founders:  Walt Disney,
Roy O. Disney
Headquarters: 500 South Buena Vista Street, Burbank, California, United States
Website: thewaltdisneycompany.com

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Who Invented?

👉🏽 Telephone, 1876. Inventor : Alexander Graham Bell (U.S.) (1847-1922). First exchange at Boston, Massachusetts, 1878.

👉🏽 Telescope (1st refracting), 1608. Inventor : Hans Lippershey (German-Dutch lensmaker). Demonstrated his invention called 'kijker' (meaning 'looker' in Dutch) before Dutch parliament on 2nd October 1608.

👉🏽 Time Recorder, 1890. Inventor : Harlow Bundy (USA).

👉🏽 Tractor (1st gasoline/petrol powered engine), 1892. Inventor : John Froelich (U.S.). Completed in Iowa (September 6 1892).

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720. What happens to the blood in your body when you die?

First your heart stops pumping, so the flow of blood around your body stops. This causes the blood to coagulate, forming clots and becoming thick and lumping. Your muscles then stiffen in a process known as rigor mortis, which also stops you breathing and means no oxygen gets to your cells.
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​​​​​​💻 Know About Company 💻

Name: Nike, inc.
Formerly called: Blue Ribbon Sports (1964–1971)
Industry: Apparel, Accessories, Sports Equipment
Founded: January 25, 1964
Founders:  Bill Bowerman, Phil Knight
Headquarters: Washington County, Oregon, United States
(Near Beaverton, Oregon)
Website: www.nike.com
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​​​​🔰 Know About Country 🔰

Country: Algeria
Capital: Algiers
Language: Arabic, Berber
Currency: Algerian Dinar
Continent: Africa
Area: 23,81,741 Km-sq
Population: 4,04,00,000 (January 2016 Estimate)
Density: 15.9 per Km-sq
Calling Code: +213
Internet Domain: .dz

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721. What is the difference between Venom and Poison?

Venom and Poison are both toxic substances. Still, some animals are called venomous and others are poisonous. The only difference between being called poisonous or venomous is in the way these animals deliver the harmful substance.

Venom: When animals like snakes use their sharp fangs to bite into the flesh and let the toxic substance move into the body of their prey,  through the punctured skin, they are called venomous animals. To deliver venom an animal has to use tools like fangs or stingers.

Poison: Poison is something that can get inhaled, ingested or seeped into the skin directly. For example, if you accidentally touch a brightly colored poison dart frog, you will transfer the toxins it secretes from its skin, to your own skin. And then the poison will seep into your blood stream.
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​​​​🔰 Know About Country 🔰

Country: Albania
Capital: Tirana
Language: Albanian
Currency: Albanian lek
Continent: Europe
Area: 28,748 km-sq
Population: 2,876,591 (January 2017 Estimate)
Density: 98.0 per Km-sq
Calling Code: +355
Internet Domain: .al

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722. Why Is Water Wet?

'Wet' is ultimately just a word that applies to water. What we feel as wetness is actually coldness as the water evaporates. Below is an experiment from the Institute of Physics to test the feeling of 'wetness' between two different liquids:
The feeling of wetness is actually coldness. You can test this by comparing water with another liquid - cooking oil - which doesn't evaporate so freely
Liquids make surfaces wet (i.e. they stick to many solid surfaces) due to the electrostatic (opposite charges) forces between molecules. Water is polar—it has an uneven spread of electrical charge—which makes one end of the molecule positive and the other end negative. This causes water to be attracted to many surfaces and also explains many other properties of water.