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People may think computer punch cards are obsolete, but their durable form factor mean they are a fascinating snapshot into how people stored data and wrote programs over fifty years ago. I've acquired several boxes of punch cards which were used in…

Bookmark with philosophiocal logic puzzle.

In 1962 Martin Gardner published an article about a remarkable poem. As far as I know, his is the only scholarly article that has ever been published pertaining to this poem. There is a rich and particular connection between poetry and the more…

A one-page puzzle with attached solution will be provided, including the instructions for this variant and the clues and grid.

Lewis Carroll, the nom de plume of the Rev. Charles L. Dodgson, a mathematics lecturer at Oxford, was also an innovator in recreational mathematics, magic, puzzles, cryptography, and inventions. His appearances in Scientific American began with…