In the May 27 SN: Genetic intruders, seeing Chaco in a new light, an artificial womb, Mars’ origin revisited, domestication of the horse, glimpsing Earth’s glacial past, what’s in a fang blenny’s bite and more.
Footprints left in volcanic ash that
fell in central Mexico’s ValsequilloBasin
about 40,000 years ago are evidence that humans have inhabited the Americas
far longer than previously confirmed, a new study suggests.