Science to me is about exploring what's unknown and what's impossible. So what happens if you implant eyes onto a tail of a blinded tadpole? One might not expect anything — the brain of a tadpole didn't evolve to find an eye on its tail. But developmental biologist Michael Levin at Tufts University and his colleagues discovered these eyes can help tadpoles see again, helping reveal how adaptable the brain is. (For more images, look at this photo gallery.)
Crazily enough, the eyes survive the destruction of the tail during tadpole to frog metamorphosis and end up healthy. On the frogs' butts.