A 1925 Popular Science illustration of Anton Flettner’s rotor ship, a “sailing ship without sails,” that amazed readers—and Albert Einstein. “Denuded of all sails, masts, and riggings,” wrote G. B.

Ships harnessed winds as the primary means of propulsion for many centuries before steam engines took center stage in the 1800s; it's quite poetic how maritime travel was greenhouse gas-free long ...

Breakthroughs, discoveries, and DIY tips sent every weekday. Terms of Service and Privacy Policy. On the rough and icy waters of the North Sea in 1925, an unusual ...