Tweet
RT @LettersOfNote: This is common tipping behaviour amongst mathematicians: http://twitpic.com/71pkn4 @danbenjamin @gruber @hotdogsladies
(original)
RT @LettersOfNote: This is common tipping behaviour amongst mathematicians: http://twitpic.com/71pkn4 @danbenjamin @gruber @hotdogsladies
(original)