 and ended up coming back from the brink of extinction by learning to track tides and accessing shellfish, oysters, mussels, and sea snails. They found piles of these shells near these small, small camps of humans. And you can get about 3,500 calories an hour by tracking shellfish in the right conditions. And by that point, this is all due to the fact that our brain was pretty big and pretty complex, basically the same as it is today with a few exceptions.