Euclid published Elements, systematizing geometry into axioms and proofs. It remained the standard geometry textbook for over 2,000 years.
Copernicus proposed that the Earth orbits the Sun, not the other way around — directly challenging over a thousand years of accepted belief and setting the stage for the Scientific Revolution.
Newton formulated his three laws of motion and the law of universal gravitation, unifying celestial and terrestrial physics into one mathematical framework.
Jenner discovered that infection with cowpox provided immunity against smallpox — the first vaccine, laying the foundation for all modern immunology.
Darwin published On the Origin of Species, explaining how species change over time through natural selection — the unifying theory of all biology.
Mendeleev organized the known elements by atomic mass and predicted the properties of undiscovered elements — several of which were later found exactly as he described.
Einstein showed that time and space are not absolute, that the speed of light is constant for all observers, and that mass and energy are equivalent — forever changing physics.
Fleming noticed that mold was killing bacteria in his petri dish. This accidental discovery led to antibiotics — one of the most important medical advances in human history.
Watson and Crick, using X-ray data from Rosalind Franklin, described the double helix structure of DNA — unlocking the molecular basis of heredity and modern genetics.
NASA's Apollo 11 mission landed humans on the Moon for the first time, a feat of engineering, mathematics, and physics that proved what was possible when science was taken seriously.
The Large Hadron Collider at CERN confirmed the existence of the Higgs boson, the particle that gives other particles mass — completing the Standard Model of particle physics.