Don't miss last week's most-read piece – Michael Graziano on the evolutionary origins of laughter, smiles and tears: http://aeonm.ag/1uN5Umf
4:00 PM - 23 Aug 2014
0 replies
3 retweets
7 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.