BC. Casting Out Nines
How do modern “trap-door” encryption schemes work? Over the next three weeks we'll explain, but to warm up, we talk about the medieval practice of “casting out nines”.
BA. The Ring is Exchanged
Peter Winkler answers his puzzle set in the Land of Kleptomaniacs, and we chat about Martin Gardner. We'll pose another puzzle next week!
AZ. Another puzzle from Peter Winkler
We answer last week's puzzle and Peter Winkler asks how to send a ring through the land of the kleptomaniacs.
AY. Dollar Cost Averaging
A common investment strategy takes advantage of the subtleties of averaging.
AX. Averages are not what they seem!
Is a man of perfectly average height, and perfectly average weight, too heavy for his size? Averages are not what they seem to be.
AW. Will we run out of Social Security Numbers?
When will the crisis come? When will we run out of Social Security Numbers, and other musings.
AV. Dennis Shasha Answers
Dennis Shasha, author of The Puzzler’s Elusion explains how his finger multiplication works!
AU. Dennis Shasha asks about Polish Multiplication
Dennis Shasha, puzzle columnist for Scientific American, asks about a curious way to multiply numbers on your fingers.
AT. Peter Winkler Answers
Peter Winkler answers. Another puzzle next week!
AS. A Puzzle From Peter Winkler
Peter Winkler, author of “Mathematical Puzzles: A Connoisseur's Collection”, asks how many coins are needed to cover a table.
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