Potholer54 carbon dating
It's such a dangerously wonderful and far-reaching view of life that some people find it unacceptable, despite the vast body of supporting evidence.
As applied to our own species, Homo sapiens, it can seem more threatening still.
The notion that Earth orbits around the sun rather than vice versa, offered by Copernicus in 1543, is a theory.
That's what scientists mean when they talk about a theory: not a dreamy and unreliable speculation, but an explanatory statement that fits the evidence.
The work of the 19th-century English naturalist shocked society and revolutionized science.