Word: founds
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Dates: during 1990-1999
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...such "uncommon ugliness." Perhaps remorseful about the lost child and distanced by his absorption with his work--his only real passion--and his growing fame, Mileva became increasingly unhappy. On the eve of World War I, she reluctantly accompanied Einstein to Berlin, the citadel of European physics, but found the atmosphere insufferable and soon returned to Zurich with their two sons...
...They compared the speed of light in two beams at right angles to each other. As the earth rotates on its axis and orbits the sun, they reasoned, it will move through the ether, and the speed of light in these two beams should diverge. But Michelson and Morley found no daily or yearly differences between the two beams of light. It was as if light always traveled at the same speed relative to you, no matter how you were moving...
Einstein continued to work on the problem in Berlin, undisturbed by domestic matters and largely unaffected by the war, until he finally found the right equations, in November 1915. Einstein had discussed his ideas with the mathematician David Hilbert during a visit to the University of Gottingen in the summer of 1915, and Hilbert independently found the same equations a few days before Einstein. Nevertheless, as Hilbert admitted, the credit for the new theory belonged to Einstein. It was his idea to relate gravity to the warping of space-time. It is a tribute to the civilized state of Germany...
...take place to active participants in the dynamics of the cosmos. This led to a great problem that is still at the forefront of physics at the end of the 20th century. The universe is full of matter, and matter warps space-time so that bodies fall together. Einstein found that his equations didn't have a solution that described a universe that was unchanging in time. Rather than give up a static and everlasting universe, which he and most other people believed in at that time, he fudged the equations by adding a term called the cosmological constant, which...
...Roosevelt's lasting accomplishment that he found a middle ground between the unbridled laissez-faire of the '20s and the brutal dictatorships of the '30s. His conviction that a democratic government had a responsibility to help Americans in distress--not as a matter of charity but as a matter of social duty--provided a moral compass to guide both his words and his actions. Believing there had never been a time other than the Civil War when democratic institutions had been in such jeopardy, Roosevelt fashioned a New Deal, which fundamentally altered the relationship of the government to its people...