“If I shall have sufficient strength to improve and amplify what was written and published by me up to now about motion by adding some little speculations, and in particular those relating to the force of percussion, in the investigation of which I have consumed hundreds and thousands of hours, and finally reduced this to very easy explanation, so that people can understand it in less than half an hour of time.”

— Galileo Galilei

Letter to Giovanni Battista Baliani (1639)

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Galileo Galilei 70

Italian mathematician, physicist, philosopher and astronomer 1564–1642

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