 Yeah, so fire was incredibly important, and I encourage anyone out there who's interested to read the book Catching Fire by anthropologist Richard Wrangham at Harvard, who actually wrote a blurb for my book. It's on the back of it. Fire was huge. So like I said, not only was it a social driver because it allowed us to create camps and mingle into the night, but it allowed us to cook our food, which does a lot of things. One, it sterilizes it. It kills microbes.