[Cedric]

Okay, gravity is a fact and, conversely, evolution is a theory.

[gcruse]

Evolution is also a fact.
The theory of evolution, as with the theory of gravity, is an attempt to discern how it works.

[El Cid]

Re: 148

Okay, gravity is a fact and, conversely, evolution is a theory.

I vote for '...evolution is wild-arsed speculation'...