Card 1 of 9: On the Origin of Species: Natural Selection
Darwin's whole argument fits in one sentence: organisms that reproduce better, reproduce more. Run that filter for a few hundred million generations and you get eyes, wings, and brains — no blueprint required.
Hamilton solved a problem Darwin admitted he couldn't: why do animals sacrifice themselves for relatives? In 1964 he showed evolution favors genes, not individuals — and genes exist in relatives too.
Dawkins reframed a century of evolutionary biology around one shift in perspective: stop asking what's good for the animal, and ask what's good for the gene riding inside it. Everything else follows.
An Augustinian friar spent eight years cross-breeding pea plants in a monastery garden and, without knowing what a gene physically was, worked out the mathematical rules of inheritance that genetics is still built on.
For decades after Darwin, genetics and evolution were seen as separate, even conflicting fields. Dobzhansky's famous 1973 essay title stated the resolution as settled fact: they were never actually separate at all.
The fossil record has an awkward feature Darwin himself worried about: it's full of gaps rather than smooth transitions. In 1972, two paleontologists argued the gaps weren't missing evidence — they were the actual pattern.
Margulis's paper was rejected by roughly 15 journals before publication in 1967. Her claim sounded implausible: the power plants inside your cells used to be independent bacteria that got swallowed and never left.
In a paper barely a page long, Watson and Crick described a molecule's shape — and in doing so, answered a question biology had circled for decades: what is a gene, physically, and how does it copy itself?
Van Valen named his 1973 theory after the Red Queen in Through the Looking-Glass, who tells Alice: 'it takes all the running you can do, to keep in the same place.' He argued species face exactly that problem.