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Search results 1861 - 1870 of 1989 matching essays
- 1861: The Environmental Impact of Eating Beef and Dairy Products
- ... dairy cow's tail- without use of an anesthetic. This procedure, the rationale for which is that it keeps cows cleaner, is completely unnecessary. It also deprives the cow of her natural means of swatting flies. Newborn dairy calves are typically taken from their mothers at birth of shortly thereafter. Some female calves are kept as replacements for cows in the dairy herd. The other calves are sent to slaughter as ...
- 1862: The Dung Beetle, What a Marvelous Creature.
- ... mouths, squeeze it, and drink the juices that come streaming out! The solid parts of the dung are squeezed for a second time in their jaws, and then swallowed. If there are any eggs that flies might have laid inside the dung, this squeezing action kills them. Now, before you say "Gross!" think about this: There are millions of animals on this planet, and they all produce waste. People take care ...
- 1863: Center of Gravity
- ... Many toys that have trouble balancing themselves, have their actual center of gravity far from where an observer would locate it. Another example of the importance of the center of gravity is how an airplane flies. If the center of gravity is too far forward, the plane will have an unstable equilibrium and in turn will take a nose dive into the ground. If the center of gravity is too far ...
- 1864: Oxygen
- ... air. Diatomic oxygen is colorless, odorless, and tasteless. Two 18th-century scientists share the credit for first isolating elemental oxygen: Joseph PRIESTLEY (1733-1804), an English clergyman who was employed as a literary companion to Lord Shelburne at the time of his most significant experimental work, and Carl Wilhelm SCHEELE (1742-86), a Swedish pharmacist and chemist. It is generally believed that Scheele was the first to isolate oxygen, but that ...
- 1865: The Noble Gases
- ... was discovered in 1898 by Sir Walter Ramsey and Morris W. Travers. Its uses include electric signs,lamps,and lasers. Argon is the most abundant and most used noble on earth. It was discovered by Lord Rayleigh and by Sir Walter Ramsey in 1894. Argon makes up about 1.2 % of the earths atmosphere. It is found naturally in rock and in the air. It is used for electric light bulbs ...
- 1866: Iron
- ... There are two ways iron deposits are located. In the first method special machines that detects the iron's magnetism are used ti find a deposit. In the second method a plane with special equipment flies over an area of land suspected of having ore deposits and shoots down sound waves to determine if that area contains iron deposit. The waves come back up to the plane and determined by the ...
- 1867: The Peregrine Falcon
- ... travel all the way to Brazil. American peregrines and Peale's peregrines do not fly as far. The young birds don't need a guide. Instinct tells them where to go when the food supply flies south. When the first frost hits in the south, all peregrines begin following their prey back north. They usually return to their nest, although on some occasions their nest may be gone or they followed ...
- 1868: The Atmospheric Ozone Layer
- ... in ozone over the Southern Hemisphere. Fortunately for the globe, the massive fleets of supersonic transports never eventuated. The Concorde was barred from landing at many airports for noise and other environmental reasons and now flies only limited routes, mainly from Great Britain and France. Concern over Nox emissions has been overshadowed by the potential problems associated with the chlorofluorocarbons. Chlorofluorocarbon species In 1974, Molina and Rowland first suggested that anthropogenic ...
- 1869: Fusion
- ... at the stars, and for just as many years humankind has tried to explain the existence of those very same stars. Were they holes in an enormous canvas that covered the earth? Were they fire-flies that could only be seen when the Apollo had parked his chariot for the night? There seemed to be as many explanations for the stars as there were stars themselves. Then one day an individual ...
- 1870: Mimicry In Nature
- ... by other insects and even spiders. Stoop down to inspect an ant colony, and chances are you'll find a few interlopers that aren't really ants at all but copycat spiders (or wasps or flies). One way you might distinguish between host and guest is by counting legs: Ants have six legs while spiders have eight. Look carefully and you might see a few spiders running around on six legs ...
Search results 1861 - 1870 of 1989 matching essays
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