Word: knowns
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Dates: during 1990-1999
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...price, in this case, takes the form of additional complications. Among other things, string theory requires the existence of up to seven dimensions in addition to the by now familiar four (height, width, length and time). It also requires the existence of an entirely new class of subatomic particles, known as supersymmetric particles, or "sparticles." Moreover, there isn't just one string theory but five. Although scientists could rule out none of them, it seemed impossible that all of them could be right...
Einstein's friend and fellow physicist Abraham Pais called him "the freest man I have known," by which he meant that by the pure act of thinking, Einstein controlled his destiny. His mind was utterly fearless, and by its uses he diminished fear in others. "It stands to the everlasting credit of science," Einstein wrote, "that by acting on the human mind, it has overcome man's insecurity before himself and before nature." And so he became a model of what humans might do if they put their mind...
When he died, even his most partisan adversaries felt compelled to acknowledge the immensity of the man they had opposed. Senator Robert Taft, known as Mr. Republican, considered Roosevelt's death one of the worst tragedies that had ever happened to the country. "The President's death removes the greatest figure of our time at the very climax of his career, and shocks the world to which his words and actions were more important than those of any other man. He dies a hero of the war, for he literally worked himself to death in the service of the American...
...chaotic era, and William of Normandy, born around 1027, was the child of chaos. The illegitimate son of Robert, Duke of Normandy, he was known for most of his life as William the Bastard. Robert eventually recognized him, but only as he departed on a fatal pilgrimage to the Holy Land, leaving his seven-year-old a target for usurping barons. One by one, William's guardians and advisers were cut down. The boy escaped assassination only by a desperate flight to his mother's estate...
Little is known of the life and development of Giotto di Bondone, born around 1267 to peasants in the bucolic valleys outside Florence. Legend says the country boy tending his flocks was discovered by the painter Cimabue, who saw him draw a fine sheep upon a rock. A more likely tale has him haunting Cimabue's Florentine bottega until the painter made him an apprentice. There Giotto absorbed his mentor's strength of drawing and sense of drama, but nature was his true teacher. He divined how to depict, with brush and pigment, the human body according to the prescription...