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How to Fold Paper into an Envelope (Easy Step-by-Step Graphic)
It’s a nice feeling to get a note or card in the mail ... Now you know how to fold paper into an envelope! Also read — 30 ...
Scientific American3y
Here’s How to Make Flexagons—Folded Strips of Paper with Strange and Surprising Properties
Editor’s Note: Published in 1956 ... For amusement he began to fold the trimmed-off strips of paper in various ways, and one of the figures he made turned out to be particularly intriguing.