Mysterious triangular structure spotted in the Nevada desert fuels lost civilization theories

A baffling triangular formation deep in the Nevada desert is igniting theories that it could be the handiwork of a forgotten ...
Scientific American

Here’s How to Make Flexagons—Folded Strips of Paper with Strange and Surprising Properties

Editor’s Note: Published in 1956, this article proved so popular that it served as the inspiration for Martin Gardner’s legendary Scientific American column Mathematical Games. Read more in our ...