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BigBen is the colloquial name of the Clock Tower of the Palace of Westminster in London, and an informal name for the Great Bell of Westminster, the largest bell in the tower and part of the Great Clock of Westminster.
BigBen is a focus of New Year celebrations in England, with radio and TV stations tuning to its chimes to welcome the start of the year.
BigBen is often used in the Physics classroom to demonstrate the difference between the speed of light and the speed of sound for British children.