Venkatesh Rao@vgrCorrection, $4.99, not free. Misread the Kindle Unlimited price for the cover price.Quote TweetVenkatesh Rao@vgr·Oct 22, 2016This looks interesting. The mechanics of emotion by @APXHard currently free on kindle http://amzn.to/2evtLGS11:19 PM · Oct 22, 20162 Likes