What was the most important transition in human history, the thing that most drastically altered our species' way of life? David Reich's lab has found evidence pointing to a new answer. There are two standard candidates: 1. The shift from hunting and gathering to farming, around 10,000 BC. 2. The Industrial Revolution, around 1800 AD. Here's one way to adjudicate this: When a species' environment changes drastically, natural selection accelerates, because the species has to catch up to…