Sir Isaac Newton 's Apple Tree, England
In 1666, while the young Isaac Newton studied at Cambridge University, the Great Plague stampeded through England, crippling the country and forcing many public buildings to close. Consequently, Newton was forced to leave Cambridge and return to his home in Lincolnshire. It was there, sitting in his mother's garden, that Newton allegedly witnessed an apple falling from a tree and began to wonder why it fell straight to the earth. He devoted the next few years to studying the laws of gravity. Historians haven't found an account of the apple-tree story written by Newton. However, a man named William Stukeley, Newton's first biographer, recorded a conversation he had with the scientist in 1726 on manuscripts recently released by the Royal Society in London: During the conversation, Newton mentioned the apple story while sitting under a different apple tree in London. This tree, which grows on the Cambridge University campus, is supposedly a direct descendent of the tree in Newton's mother's garden.