When you think of evolution, you probably imagine a slow process, one that happens in some verdant jungle or plain. For example: Homo Sapiens gradually evolving over millions of years on the savannah. Or the finches of the Galapagos adapting to their unique environment. But Menno Schilthuizen, a biologist and author of “Darwin Comes to Town: How the Urban Jungle Drives Evolution,” says that evolution can hapen a lot faster, and a lot closer to us, than we might think. And humans, along with the cities we build, drive a lot of it.