Burrhus Frederic Skinner was an American psychologist, author, inventor, social philosopher, and poet. He was the Edgar Pierce Professor of Psychology at Harvard University from 1958 until his retirement in 1974. Skinner invented the operan...

Ralph Kronig was a German American physicist. He is noted for the discovery of particle spin and for his theory of x-ray absorption spectroscopy. His theories include the Kronig–Penney model, the Coster–Kronig transition and the Kramers–Kro...

One of the most influential artists of the twentieth century, was born in Rotterdam, Holland, in 1904. Following formal studies in fine and applied art at the Rotterdam Academy, he emigrated to America at age twenty-two. In New York he init...

One of the old guard of the Chinese Communist Party, Deng Xiaoping became the party's Secretary General in 1954, but was purged by Chairman Mao in 1966 for his strong objections to the excesses of the Great Leap Forward. By 1974 Deng had be...

The book is a chronology of the development of the theory of Relativity. Starting with Lorentz' papers on Michelson's interference experiment and electomagnetic phenomena in moving frames of reference, the book follows the rapid development...

In physics, mass–energy equivalence is a concept formulated by Albert Einstein that explains the relationship between mass and energy. It expresses the law of equivalence of energy and mass using the formula E = mc2 where E is the ene...

The Revolution of 1905 was a wave of mass political and social unrest that spread through vast areas of the Russian Empire. Some of it was directed against the government, while some was undirected. It included worker strikes, peasant unres...

Astrid of Sweden was the Queen consort of King Leopold III of the Belgians. She was the third daughter of Prince Carl, Duke of Westrogothia, and his wife Princess Ingeborg of Denmark. She married Leopold on November 4, 1926, and became Q...

Kuiper is considered to be the father of modern planetary science for his wide ranging studies of the solar system. Although he contributed to astrophysics, established the atmosphere of Saturn's moon Titan, and discovered Saturn's moon Mir...

Howard Robard Hughes, Jr. was an American business tycoon, investor, aviator, aerospace engineer, inventor, filmmaker and philanthropist. He was one of the wealthiest people in the world. As a maverick film tycoon, Hughes gained prominence...

Jean-Paul Charles Aymard Sartre was a French philosopher, playwright, novelist, screenwriter, political activist, biographer, and literary critic. He was one of the key figures in the philosophy of existentialism and phenomenology, and one...

Albert Speer was a German architect who was, for part of World War II, Minister of Armaments and War Production for the Third Reich. Speer was Adolf Hitler's chief architect before assuming ministerial office. As "the Nazi who said sorry",...

Viktor Emil Frankl was an Austrian neurologist and psychiatrist as well as a Holocaust survivor. Frankl was the founder of logotherapy, which is a form of Existential Analysis, the "Third Viennese School of Psychotherapy". His best-selling...

Thomas "Tommy" Harold Flowers was an English engineer. During World War II, Flowers designed Colossus, the world's first programmable electronic computer, to help solve encrypted German messages. Flowers's first contact with the wartime...

Max Schmeling was a German boxer who was heavyweight champion of the world between 1930 and 1932. His two fights with Joe Louis in the late 1930s transcended boxing and became worldwide social events because of their national associations....