Visual Economics has a fun chart that shows how many of each denomination of U.S. currency is in circulation, as well as their average lifespans. For some reason, the $5 bill has the shortest lifespan. Also, seriously, we need to stop producing pennies NOW.
trivia
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Pillsbury has told a New York food co-op to stop using the phrase “bake-off” because they own it. Pillsbury coined the phrase back in 1949 (according to this unverifiable web source), and then trademarked it in the early 1970s (according to another). Now you know. (Thanks to Sarah!)
Social Security Numbers Decoded
The Tao of Making Money has collected a bunch of interesting facts about Social Security Numbers, for example: