You've heard of wind and solar. But what about harnessing other forces of nature for energy? Like, tornadoes. That's Louis Michaud's idea. He's an engineer who dreams of powering the world with tornado machines. Flora Lichtman of The Adaptors Podcast filed this story for the public radio show Marketplace. Hear more stories like this on The Adaptors Podcast: https://itunes.apple.com/us/podcast/the-adaptors/id960840471?mt=2