Scientists Tickled Gorillas And Found A 15-Million-Year-Old Clue To How Humans Learned Speech

TL;DR

Reports differ across sources; according to forbes.com, topline The vocal control underpinning human speech was not a sudden evolutionary leap, but a 15-million-year work in progress, according to researchers at the University of Warwick who tickled gorillas and recorded chimpanzee play sessions to make the discovery.