We call it Darwinism, for short. But in truth, it didn't start with Darwin, or with Wallace either, for that matter. Great ideas seldom arise in the romantic way we like to imagine—the bolt from the blue, the lone genius running through the streets crying, "Eureka!" Like evolution itself, science more often advances by small steps, with different lines converging on the same solution.

Great wizard he! by magic spells
Can all things raise from cockle shells.