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1589 Galileo Galilei uses balls rolling on inclined planes to show that different weights fall with the same constant acceleration
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1609 Johannes Kepler states his first two empirical laws of planetary motion
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1609 Galileo Galilei builds his first telescope
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1613 Galileo Galilei uses sunspots to demonstrate the rotation of the sun
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1665 Isaac Newton deduces the inverse-square gravitational force law from the acceleration of the moon
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1752 Benjamin Franklin shows that lightning is electricity
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1798 Count Rumford has the idea that heat is a form of energy
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1800 Alessandro Volta announces his invention of the electric battery
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1831 Faraday discovers electromagnetic induction
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1888 Heinrich Hertz discovers radio waves
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1915 Albert Einstein completes his theory of general relativity
