In honor of the great thinkers whose discussions moved humanity forward, retold as they unfolded: how bold ideas met hard tests, and criticism helped us find a little truth. Simplified and put together by AI.
270 BCE–1927 · 12 events
The ground feels still, and anyone can see the Sun circle us. Overturning that took two thousand years. It revealed that we ride a planet that spins, circles the Sun, and sweeps around the Milky Way at 230 kilometers a second.
Aristarchus of Samos, Claudius Ptolemy, and 10 others
1687–2020 · 10 events
For two centuries, Newton’s law of gravity passed every test but one: a slight drift in Mercury’s orbit. Einstein’s explanation revolutionized our view of space and time.
Isaac Newton, Urbain Le Verrier, and 11 others
1690–1997 · 12 events
Huygens said light is a wave, Newton that it’s a stream of particles. Both were wrong, and working out what light really is showed that our universe is one of many.
Christiaan Huygens, Isaac Newton, and 12 others
1842–1962 · 9 events
Physicians blamed disease on foul air while their own hands spread it from patient to patient. A few doubters found the real cause: living things too small to see. Their discovery has saved countless lives.
Edwin Chadwick, Ignaz Semmelweis, and 7 others