Charles Darwin publishes the theory of evolution -- Fossils provide the first clues -- Africa is the "cradle of humankind" -- Scientists have ways of dating objects -- Dna shows how close humans are to ancestors -- Climate change shapes human evolution -- "Hobbits" lived in Asia -- The "missing link" doesn't exist -- Homo sapiens are basically brand-new -- Humans are still evolving, but differently -- Homo naledi changes thoughts on human thought -- Life could have started in space.