Galileo Galilei was born in 1564. When he was young, he expressed his scientific knowledge. For example, he discovered the isochronism of the pendulum at the age of nineteen. At the age of twenty two he invented the hydrostatic balance. At age twenty five he made a speech at the University of Pisa, which gave him the spotlight in Europe and as a scientist and lecturer.
Nicolaus Copernicus became famous in 1543 when he published "Revolutions of the Celestial Orbs." This stated that the earth orbited around the sun. His theory is related to skepticism. This theory differ to the philosophy of the Aristotle, the astronomy of Ptolemy and the teachings of the church.
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