8/23/2013 7:39:13 AM
In an emergency, clean drinking water can be tough to find. Floods, earthquakes and hurricanes can make our usual sources of water potentially unsafe. After the 2004 tsunami in the Indian Ocean left many without access to clean water, researchers from Nanyang Technological University in Singapore and the University of Colorado, Boulder decided to create a water purification system that could kill bacteria quickly without requiring a power source. They came up with a bacteria-killing, spongy polymer gel that absorbs water, then releases it in a purified form when squeezed.
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