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The Evolution of Memory
The ability to have children through kind of live birth also seems to have been at least in part made possible by one of these retrovirus infections that occurred. So we have memory because in early ancestor of human, of Homo sapiens, got a virus. And scientists have managed to breed mice or rats without this particular gene. These rodents aren't able to learn things and don't seem to be able to remember things. It's really kind of mind-boggling.