It's always great to see innovative uses of eco-friendly ideas, and this new water-powered alarm clock from the UK's Gadget Shop is no exception.

We've seen water-powered alarms before, but not in so simple and stylish a design. I still don't quite understand how these things work (even though the Gadget Shop's website says that "a magical electrochemical reaction between the electrodes and water produces electrical energy." A magical reaction? I must have snoozed through the science lesson where magic was discussed) but they couldn't be simpler to use. Simply rotate the inner wheel to see the clock's other functions (including timer and temperature) and fill with water every 2-3 months.

Who needs batteries?!