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At a young age, while watching a lamp swinging in the Pisa Cathedral, Galileo discovered that each full swing of a pendulum takes exactly the same amount of time regardless of whether the arc of the swing is wide or narrow. He used his own pulse to measure the time

Galileo (1564-1642) challenged some of the fundamental knowledge of his time, providing proof that certain long held beliefs were incorrect, and paving the way for a better scientific future. In his time it was accepted that the Earth was at the centre of the universe and the planets, including the