U.S. ecologist has claimed that humans are not from Earth but were put on the planet by aliens tens of thousands of years ago. Dr Ellis Silver points to a number of physiological features to make his case for why humans did not evolve alongside other life on Earth, in his new book.

They range from humans suffering from bad backs – which he suggests is because we evolved in a world with lower gravity – to getting too easily sunburned and having difficulty giving birth.