"physics" (who is also a user on Twitter) has been ++'ed 1 times and --'ed 2 times by a total of 2 people.
Activity Feed icon
Operation Sign, User and Reason
--'ed by oreillymedia (A Learner's Companion to Mechanics and Practical Physics http://tinyurl.com/4uhlt4)
Tweet: Head First Physics--A Learner's Companion to Mechanics and Practical Physics http://tinyurl.com/4uhlt4
++'ed by ara_p
Tweet: Oops, plusplusbot just caught my minusminus of the word "Physics." That was unintentional for sure, so for balance: physics++
--'ed by ara_p (Mostly (via Wired): http://tinyurl.com/6yv7pa)
Tweet: Iron Man's Suit Defies Physics--Mostly (via Wired): http://tinyurl.com/6yv7pa