Sand is a cheap and easy to find water filter. It's also not a very good water filter. But a new development--coating sand in graphite--could make it possible for everyone in the world to have easy access to clean water.READ»
India's Tata Group is famous for launching the the world's cheapest car, the Nano compact. Now the company is taking on the challenge of providing clean drinking water to the 894 million people worldwide who lack access to it. The ...READ»
