hillarious.

http://www.mission-base.com/pedal-power/pp_prop1.html

16"diameter x 24" pitch made out of laminated epoxied wood, apparently
suitbale for human propulsion! Lots of complex mathematics and
formulas wonderful for endless disputes or alternatively gaining
enlightenment through the head-spinning method.

A hoax or for real? I couldnt decide, but worth a read anyway ;-)

Shaun