Let's take some of them, start breeding them so they're more suitable for human consumption so that they are easier to raise, maybe more robust, and we will breed them, and we will raise them for milk, for meat. We also started to domesticate plants. Instead of saying, okay, let's just gather those berries there where it happens to emerge, let's actually start to plant things, and on a very predictable way, be able to harvest them and so have a more predictable food supply. Both of these things allowed human beings to have a higher population density, to start to settle down, to have a more sedentary life. And this is a huge, huge, huge deal. Just to get a sense, we believe that the carrying capacity for the planet, for human beings as hunter-gatherers, is 10 million people. And that is what we estimate the world population was at around the time of the last ice age, or shortly afterwards.