Evolution and the Human Body

Evolution seems like such a crude tool. Most mutations are bad and any one mutation is likely to have a small impact. But so much of evolution is derived from copying, repurposing, modifying things that already exist. So you can get great complexity happening from simplicity. By the way, we're not the most complex critters on the planet. I guess we have 26 trillion cells, but there are a lot of creatures that have more genes."