Index Education & Reference Science Results 1 - 10 of 385 Ball Bearings Are Flat – Another Myth Crushed Author : amabaie What shape are ball bearings? They are shaped like a ball, as everyone knows, right? The funny thing about what everyone knows is that everyone can be wrong. For instance, everybody thinks that the America's Cup is an ocean-sailing race, and yet the Swiss managed to win the Cup. For those readers who are geographically-challenged, Switzerland is a land-locked country comprised entirely of mountains. What does this have to do with ball be... | Read more... The History of Calendars (via CobWeb/3.1 kupl1.ittc.ku.edu) Author : Sam Vaknin Orthodox Christians celebrate Christmas on January 7. Their "old new year" is a week later, on January 14. It is all Julius Caesar's fault ... The Romans sometimes neglected to introduce an extra month every two years to amortize the difference between their lunar calendar and the natural solar year. Julius Caesar decreed that the year 46 BC should have 445 days (some historians implausibly say: 443 days) in order to bridge the yawning discrep... | Read more... The Fourth Law (of Robotics) Author : Sam Vaknin The movie "I, Robot" is a muddled affair. It relies on shoddy pseudo-science and a general sense of unease that artificial (non-carbon based) intelligent life forms seem to provoke in us. But it goes no deeper than a comic book treatment of the important themes that it broaches. I, Robot is just another - and relatively inferior - entry is a long line of far better movies, such as "Blade Runner" and "Artificial Intelligence". Sigmund Freud sai... | Read more... Can we pull the moon to Earth? Author : hello Theoretically, if we send enough electrons to the moon, we can pull the moon to Earth. This is, maybe a realistic solution for our over populated, energy hunger near future. If we start to beam electrons to the moon, it's only a matter of time before the moon starts to accelerate to Earth. The attraction force between the positive Earth and the negative moon causes the acceleration. There is a danger, once this acceleration begins, it might... | Read more... characteristics of sound (via CobWeb/3.1 kupl1.ittc.ku.edu) Author : Ryan Fyfe Sound in brief but remarkeable terms is a vibration, that our ears percieve by the sense of hearing. Most commonly vibrations travel to our ears via the air. The ear then converts these sound waves into nerve impulses that are sent to our brains, where the impulses become sound. To say all that in a more technical language: Sound "is an alternation in pressure, particle displacement, or particle velocity propagated in an elastic material" (Olson ... | Read more... What are birds Author : Ryan Fyfe Birds are warm-blooded, bipedal egg-laying vertebrates that are characterized primarily by their physical features of feathers, forelimbs modified as wings, and hollow bones. Birds range largley in size from tiny hummingbirds all the way up to the huge Ostrich. Depending on how you look at it, and what your viewpoints are there are approximately ten thousand different species of living birds. Note the living. there are several others that have b... | Read more... Chemical Element Silver Author : Ryan Fyfe Silver, a chemical element, exists in the periodic table with the symbol "Ag" and atomic number 47. Silver is a soft white lustrous transition metal. Due to the fact that it has the highest electrical and thermal conductivity of any metal, silver is widel used throughout the world, used in used in coins, jewelry, tableware, and photography. Silver occurs in minerals and in free form. I'm sure if you looked you would have in your household seve... | Read more... Life of Leonardo da Vinci Author : Sam Vaknin Leonardo da Vinci was a painter, sculptor, architect, cartographer, engineer, scientist and inventor in the 15th century. Yet, despite his genius, he referred to himself as "senza lettere" (the illiterate, the man without letters). For good reason: until late in life, he was unable to read, or write, Latin, the language used by virtually all other Renaissance intellectuals, the lingua franca, akin to English today. Nor was he acquainted with mat... | Read more... Lysenko and Stalin's Genetics Author : Sam Vaknin Trofim Denisovich Lysenko (1898-1976) was an agronomist. During the reign of Lenin and Stalin years in the Soviet Union, he became the chief proponent of the work of the self-taught plant breeder Ivan Vladimirovich Michurin (1855-1935) and his brand of Lamarckism - a pre-Darwinian theory of evolution of the species proposed in the French scientist Jean-Baptiste Lamarck (1744-1829). He was appointed as the president (1938-56) of the Lenin All-Uni... | Read more... The Invention of Television Author : Sam Vaknin The transmission of images obsessed inventors as early as 1875 when George Carey of Boston proposed his cumbersome system. Only five years later, the principle of scanning a picture, line by line and frame by frame - still used in modern television sets - was proposed simultaneously in the USA (by W.E. Sawyer) and in France (by Maurice Leblanc). The first complete television system - using the newly discovered properties of selenium - was patente... | Read more... << Start < Prev 1 2 3 4 5 6 7 8 9 10 Next > End >>     [ Back ] Top AlphaContent 2.5.4 © 183 - visualclinic.fr

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