Twitter Trackbacks for Yawning is contagious. even thinking about yawning is enough. after reading this, there is a 50% chance that you will yawn. [twitter.com] on Topsy.com

286 tweets

epictweets_ Highly Influential Yawning is contagious. even thinking about yawning is enough. after reading this, there is a 50% chance that you will yawn.

08/18/2012 Reply Retweet Favorite

Topsy

3 Retweets by influential people

286 Retweets