CmdrTaco from the look-up-in-the-air dept.
An anonymous reader wrote in to tell us about a microplane that perches on power lines to recharge its batteries being developed as a surveillance device at MIT. As you can imagine, landing on a power line is hard to do ... and charging off transmission lines has its own problems.
Quantum Mechanics is a lovely introduction to Hilbert Spaces!
-- Overheard at last year's Archimedeans' Garden Party