The price of a caffe latte -- about US$3 -- really can save a life. The LifeStraw, a beefed-up drinking straw designed by the Swiss-based company Vestergaard Frandsen, uses seven types of filters, including mesh, active carbon and iodine, to make 700L of water clean enough to drink. It can prevent waterborne illnesses, such as typhoid and diarrhea, that kill at least 2 million people every year in the developing world. It can also create safe drinking water for victims of hurricanes, earthquakes or other disasters. And for the weekend warrior's back-country hike.
www.lifestraw.com

