What's the difference between a generator and a battery--I better look that up.

Fascinating! Much like the servo flashlights that are out in the market. 

As part of a research initiative on how to harness off-grid energy for low-power electronics, a pair of U.K.-based designers created a lamp that uses gravity to generate light. Martin Riddiford, co-inventor of the GravityLight, talks about plans for the innovative project. Image credit: Therefore Limited

Inventors Design Lamp Powered Entirely by Gravity

Science, technology, and other cool stuff from public radio's Science Friday. It's brain fun, for curious people. From WNYC Studios.

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