The top ten posts of the week on TreeHugger, and it's all about transportation and design!

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hollow flashlight photo

credit: Queenie Andini

3 of 12

Teenager invents a flashlight powered by the heat from your hand

This story went absolutely viral this week, the most popular video on Youtube, and you saw it here first, I think, almost. Stephen says the " Hollow Flashlight and its creator seem poised for stardom."

Teenager invents a flashlight powered by the heat from your hand