Episode 388: The Fresnel Lens (Entry 501.1C1312) - a podcast by Ken Jennings and John Roderick

In which an efficient new piece of French glassware changes the history of lighthouses, and Ken learns the exact age of Discovery. Certificate #52246.

Further episodes of Omnibus

Further podcasts by Ken Jennings and John Roderick

Website of Ken Jennings and John Roderick