Our Happy Anniversary sale has been extended through tonight. For loyal blog readers—or even if you've just stumbled over here for the first time—everything (excluding subscriptions) in the mental_floss store is 20% off. Just enter the code "blog" during checkout.

I also have five manila envelopes and just enough postage to send five readers a free back issue of our magazine. The first three people to leave a comment get one; the first two people who send a Happy Anniversary instant message to flossyjason get the others.