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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.)
 
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.
 
Who Invented?

[emoji117] 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).

[emoji117] Phosphorus, 1669. Discoverer : Hennig Brand (Germany).

[emoji117] Photography (on metal), 1826. Inventor : Joseph Nicéphore Niepce (France) (1765-1833). Sensitised pewter plate, 8 hrs exposure at Chalon-sur-Saone, France.

[emoji117] Photography (on paper), 1835. Inventor : W. H. Fox Talbot (England) (1807-77). Lacock Abbey, Wiltshire, England.

[emoji117] Photography (on film), 1888. Inventor : John Carbutt (U.S.). Kodak by George Eastman (U.S.) (1854-1932), August 1888.
 
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.
 
Who Invented?

[emoji117] Paper, c. 150. Invented in China. Introduced to West via Yarkand, c. 750.

[emoji117] 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.

[emoji117] Parchment, c. 1300 BC. Inventor : Egypt. Modern name from Pergamam, Asia Minor, c. 250 BC.

[emoji117] Parking Meter, 1935. Inventor : Corlton C. Magee (U.S.). Oklahoma City (July 16).
 
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.
 
Who Invented?

[emoji117] Nineteenth Laws of Planetary Motion, 1609. Inventor : Johannes Kepler (Germany).

[emoji117] 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.

[emoji117] Oxygen, 1775. Discoverer : Antoine Laurent Lavoisier (France).

[emoji117] Ozone, 1839. Discoverer : Christian Schonbein (Germany).
 
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.
 
Who Invented?

[emoji117] Motorcycle, 1848. Inventor : Edward Butler (England). First exhibited 1885 by Daimler, earliest factory in Munich 1893.

[emoji117] Motor Scooter, 1919. Inventor : Greville Bradshaw (England).

[emoji117] Neon Lamp, 1915. Inventor : Georges Claude (France) (1871-1960). First installation in U.S. Cosmopolitan Theatre, July 1923.

[emoji117] Night Club, 1843. Inventor : Paris, France. First was Le Bai des Anglais, Paris.
 
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.
 
Who Invented?

[emoji117] Microphone, 1876. Inventor : Alexander Graham Bell (U.S.) (1847-1922). Name coined 1878 by David Hughes.

[emoji117] Microscope, 1590. Inventor : Zacharis Janssen (Netherlands). Compound convex-concave lens.

[emoji117] Microscope (Electron), 1939. Inventor : Vladimir Kosme Sworykin (Russia, later U.S) (b. 1889), et al. Demonstrated Camden, New Jersey, 1940.

[emoji117] Molecular Hypothesis, 1811. Inventor : Amadeo Avogadro (Italy).
 
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.
 
Who Invented?

[emoji117] Machine Gun, 1861. Inventor : Richard Gaffing (U.S.) (1818-1903).

[emoji117] Maps, c. 2500 BC. Inventor : Sumerians (clay tablets). Earliest world map by Eratosthenes c. 220 BC.

[emoji117] Margarine, 1863. Inventor : Hippolyte Mege-Mouries (France). Initially, made of beef suet, warm milk and sheep stomach lining.

[emoji117] Match (Safety), 1855. Inventor : J.E. Lundstrom (Sweden). Amorphous phosphorus disc, 1845, Anton von Schrotter.
 
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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