Imagine a place on the surface of our planet that we, Homo sapiens, could not reach. We are found across the planet, from Inuit tribes in the freezing realms of the Arctic circle to the Bedouin tribes in the desert regions of the Middle East. If Elon Musk has his way we’ll be on Mars without giving the geological timescale a chance to blink its eye. But it was only between 300,000 and 200,000 years ago that our species originated from an ancestral Homo species on the African continent. So how is it that we are already looking at travelling to Mars? How and when did we make our first great expedition from Africa?