New post: This would make Jean Piaget very happy http://andrewgelman.com/2014/03/15/make-jean-piaget-happy/ …
2:45 AM - 15 Mar 2014
0 replies
3 retweets
3 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.