Why do we bite our nails? Science has an answer, sort of. http://boingboing.net/2014/07/29/why-do-we-bite-our-nails.html …
1:33 PM - 30 Jul 2014
0 replies
2 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.