From Wim Hordijk at the Evolution Institute:
Evolution is still all too often (but wrongly) downplayed as “just a theory” in public discussions. This is partly due to an unfortunate misunderstanding of what a theory means in science, as opposed to its common language meaning. Evolution by natural selection is much more than just a hypothesis, and is as much a valid and well-accepted scientific theory as the theory of gravitation. What Darwin did for biology is on par with what Newton did for physics — and mathematics plays an important role in both theories. More.
How come no physicist ever said, gravity is as real as evolution?
Note: The ‘Evolution Institute’ sounds like a dodgy outfit, “Applying evolutionary science to pressing social issues.” How’d that work in the mid-twentieth century?
See also: What the fossils told us in their own words