Make Your Own USB Powered Gadget

I've found my weekend project. Maximum PC has published nine awesome DIY projects, one of them being the steps to turn different electronics into USB powered ones. They teach you how to make a USB powered fan or booklight.

I'm thinking my blowdryer would fry my computer, but I have always wanted to make my electric toothbrush USB powered. Thoughts on what you would try to do? [Maximum PC]

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