LifeStraw

What's the most precious liquid on earth? If you said oil, you're wrong. It's water. Even though more than 70% of the earth's surface is covered in H20, many parts of the world suffer from a persistent and crippling shortage of potable drinking water. LifeStraw hopes to change all that. The 10-inch-long, 1-inch-in-diameter device is made by Vestergaard Frandsen S.A. of Lausanne, Switzerland, out of a patented resin that kills bacteria on contact. Its filters remove bacteria, such as salmonella and staphylococcus, from surface water in rivers and lakes. Reusable and, at $3 to $4 each, affordable, it has the potential to not only reduce the outbreak of disease but also to improve living standards and sanitation in many of the world's poorest regions.