15 year old Angelo Casimiro invented an electricity-generating footwear that generates power as you walk, and it can be used to charge your phone or any small battery-powered device. He entered the device into Google's Science Fair this year.

"Electricity is generated using a an insole generator that is made out of two pairs of piezoe-electric discs, which produce energy when the crystal bend inward,"explains Casimiro in his entry video. The generator is soldered to the battery of a power bank, which can then be used to plug in any device through a USB connection.