http://chronicle.com/img/photos/biz/icons/percolator-art-new.gifBy Paul Voosen. Last year, when Sir David Attenborough, the British naturalist and broadcaster, speculated that human beings had ended natural selection through cultural and technological innovations, he got a deserved amount of blowback. The criticism started with his toy-model view of evolution, and went from there. But beneath it all, there was one lingering question: Was he getting at, in any way, a kernel of truth? Read more...