Yeah, well, we measure melanin, right? So everyone started off black from Africa. We migrated and in a colder climate, the melanin in our skin changed, obviously, to white, right? So this is the aspect of how you got white people. But it's the same, it was a danger with going into colder climates, just the same as it is today with black people going into colder climates. It's still a danger for them, but we passed that barrier.