Sinsull: What does it mean to *do* a donut? Is it sort of like a miniature cartwheel?

In the April 1975 issue of Scientific American, Martin Gardner devoted his column to "six sensational discoveries" of 1974. It started with a map that required five colors, and worked its way up to a psychically powered motor. Large numbers of readers took it seriously and sent in elaborate confirmations & refutations.