A "provocative" new piece in Nature has proposed a whole new group of ancient humans - cousins of the Denisovans and Neanderthals - that once lived alongside Homo sapiens in eastern Asia more than 100,000 years ago.
Ancient footprints in Kenya unveiled Homo erectus and Paranthropus boisei coexisting 1.5 million years ago, unlocking fascinating clues about their shared world.
