Sir Isaac Newton's 367th Birthday
On 4 January 2010, Google Doodle celebrated Sir Isaac Newton's 367th Birthday, as he was born on January 4, 1643. His birthdate is sometimes also marked as December 25, 1642, due to England's use of the Julian calendar at the time. This celebrated English physicist and mathematician, known for his work on gravity and laws of motion, is a key figure in the Scientific Revolution.
Today on the Google home page, an animated apple is falling, over and over, with a satisfying plunk—a 367th birthday tribute to Sir Isaac Newton. Legend has it that Isaac Newton formulated gravitational theory in 1665 or 1666 after watching an apple fall and asking why the apple fell straight down, rather than sideways or even upward. "He showed that the force that makes the apple fall and that holds us on the ground is the same as the force that keeps the moon and planets in their orbits," said Martin Rees, President of Britain's Royal Society, the United Kingdom's national academy of science, which was once headed by Newton himself.

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