1) go back 20,000 years to the island of Flores, and watch three foot tall humans (Homo floresiensis) hunt pygmy elephants . . . so cute;
2) go back 10,000 years to the Cueva de las Manos in Argentina and watch this piece of cave art being created:
3) go back 45,000 years to Eurasia, and check out warfare and interbreeding between modern humans and neanderthals . . . this moment exemplifies the seminal paradox of the human spirit: there are some strange people on the other side of the valley . . . should we court them or kill them?