[animation by Michael A Charles]
The narrator, Garson Hampfield (a retired inker in a crossword design team), has given credit to most of the major creators in that vast and ancient domain. I'm a little disappointed, though, that he made no mention of the Phoenicians, who invented the alphabet. And he might have put in just a tiny word for the fundamental role of Euclid, too, who invented the straight line (defined as the shortest distance between two points). Try to produce a crossword puzzle without using straight lines, and you'll see exactly what I mean.