From tools to brainpower, there are plenty of theories for why we're smarter than our hominin ancestors. Recently, a mores surprising theory has emerged – grandmothers and their assistance with childcare. http://ow.ly/EDaZ30kOP4w pic.twitter.com/eWJwsQzkbd
4:00 PM - 6 Jul 2018
0 replies
8 retweets
27 likes
Loading seems to be taking a while.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.