A radio that doesn't need a battery or plug? In the "Build Your Own Crystal Radio" electricity and project students build a working crystal radio and investigate how to improve it. A convenient project kit is available to do this science project!
The Rubbee is an ingenious device allowing anyone with a conventional bike the opportunity to easily repurpose and experience all the benefits of an electric bike in literally minutes.) -might as well buy an electric bike?
Smart contact lenses for diabetics to measure sugar levels in tears! Diabetics or diabetes patients need to check their glucose levels frequently, that involves painful pricking of a finger to do a blood test.