The science video blog Veritasium offers this nifty little puzzle. Does a wooden block, when shot by a vertically aimed rifle, go higher when it’s hit dead center or off-center? In the latter case, the bullet causes the block to spin. Several science communicators are asked the question in this set-up video:
Did you pick an outcome? If not, don’t worry—here’s the result of the experiment:
UPDATE (9/3/13): Derek Muller, the creator of Veritasium, has posted the answer. Short version: commenter number 1 below, bokubob, is correct. But watch the video for some surprising details and another challenge for experimenters:
Read SA blogger Carin Bondar's interview with Derek Muller here, from 2012.