"Rapid" Evolution Observed in Guppies? As Always, It Depends on What You Mean by Evolution

Reporting in Proceedings of the Royal Society B: Biological Sciences, researchers have rigorously demonstrated something totally unsurprising -- only to turn around and offer it as evidence for something quite different and quite surprising. The technical term for that is bait-and-switch.

A team showed that if you take guppies and move them from an environment rich in predators to one that's largely predator-free, this can have an effect on a superficial trait like coloration. Who would have...