Torben Vestergaard Frandsen found a way to save lives for $3 a pop. Lifestraw works just like a regular drinking straw, but inside are seven types of filters that trap particles and bacteria as small as 15 microns, making contaminated water safe for drinking. This is a real milestone considering that more than 2 million people a year die from waterborne diseases, such as typhoid and cholera, in the developing world. What’s more, a single straw can filter a year’s worth of water before it needs replacing.—Ian Daly

www.lifestraw.com

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