Hey there, Math Club.  We're taking some time off to spend the holidays with our families, so this week we have a rerun of last year's holiday episode...  So Many Birds.

Season's Greetings!  With the holidays on the horizon, a famous song leads Pete and Noah to talk about strategies for adding up long sequences of numbers.  Come join the fun, and learn how a young Carl Gauss may (or may not) have done it.  And if you're up for a challenge, we even "sum it up" with a special holiday puzzle for you to try.

• Brian Hayes's article in American Scientist

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