"It is not easy to reinvent the wheel, but researchers at the Massachusetts Institute of Technology are giving it their best shot.
The Senseable City Laboratory at M.I.T. has designed a wheel that captures the kinetic energy released when a rider brakes and saves it for when the rider needs a boost. While technically sound, the wheel’s true challenge may be in winning over cyclists. For centuries, bikes have been beloved for their simplicity, not their bells and whistles."
Sindya N. Bhanoo reports for the New York Times December 14, 2009.