When Kai Hartmann and Frank Riedel set off for the areas where they do research, the trip often involves traveling to the very origins of humanity. Starting from Berlin, where they work at Freie Universität – Hartmann as a geographer and Riedel as a paleontologist – they travel more than 10,000 kilometers by plane and car to reach the Kalahari Desert, in Botswana, and specifically the Tsodilo Hills, northwest of the Okavango Delta.