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Nuclear power station at Leibstadt, Switzerland A nuclear reactor is an apparatus in which nuclear fission chain reactions are initiated, controlled, and sustained at a steady rate. Nuclear reactors provide heat for electricity generation, domestic ...

This article is about modelling human thought with computers. For other uses of the term AI, see Ai. Artificial intelligence, also known as machine intelligence, is defined as intelligence exhibited by anything manufactured (i.e. artificial) by huma ...

Abraham Lincoln Order: 16th President Term of Office: March 4, 1861 - April 15, 1865 Predecessor: James Buchanan Successor: Andrew Johnson Date of Birth: February 12, 1809 Place of Birth: Hardin County, Kentucky (site now in LaRue County) ...

Stephen Hawking. Reuters/Stephen Hird Stephen William Hawking, CH CBE FRS (born January 8, 1942) is one of the world's leading theoretical physicists. Hawking is Lucasian professor of mathematics at the University of Cambridge (a post once held by I ...

Alexander Hamilton Alexander Hamilton (January 11, 1755 July 12, 1804) was an American statesman, journalist, and lawyer. He is credited as being America's greatest constitutional lawyer, and with successfully defending the U.S. Constitution to skep ...

Barbara Charline Jordan (February 21, 1936-January 17, 1996) became the first African-American elected to the Texas Senate since 1883. Born in Houston, Texas's Fifth Ward, she did not like being passive in Texas politics. In 1952, she graduated from ...

A young Pablo Picasso Pablo Picasso, formally Pablo Ruiz Picasso, (October 25, 1881 - April 8, 1973) was one of the recognized masters of 20th century art. 1 Overview 2 Early life 3 Picasso and pacifism 4 Personal life 5 Later works 6 List of wor ...

See also Archimedes computer, Archimedes (disambiguation). Archimedes of Syracuse (circa 287 BC - 212 BC), was a Greek mathematician, astronomer, philosopher, physicist and engineer. He was killed by a Roman soldier during the sack of the city, desp ...

Image of the largest antarctic ozone hole ever recorded in September 2000. Data taken by the Total Ozone Mapping Spectrometer (TOMS) instrument aboard NASA's Earth Probe satellite. Ozone depletion refers to the approximately 5% reduction in in the t ...

Caffeine molecular structure Caffeine is a chemical compound found naturally in such foods as coffee beans, tea, cacao beans (chocolate, but in much smaller amounts), kola nuts, Yerba mate, and guarana. It is well known for its characteristic, inten ...

The principal natural phenomena that contribute acid-producing gases to the atmosphere are emissions from volcanoes and from biological processes that occur on the land, in wetlands, and in the oceans. The effects of acidic deposits have been detecte ...

Cryptography (from Greek kryptos, "hidden", and graphein, "to write") is, traditionally, the study of ways to convert information from its normal, comprehensible form into an incomprehensible format, rendering it unreadable without secret knowledge t ...

This view, taken with infrared light, is a false-color image of a quasar-starburst tandem with the most luminous starburst ever seen in such a combination. The quasar-starburst was found by a team of researchers from six institutions. A quasar (from ...