Humans have been using ordinary sand since ancient times as a way to remove contaminants from water. But now researchers from Rice University in Texas have developed a more efficient and effective "super sand" through a simple process that coats course sand with graphite oxide to improve contaminant retention and flow rate. With the abundance of sand throughout the world, and with graphite waste in abundant supply, this method is very cost effective. With so many high tech solutions to world problems, it's encouraging to see a growing number of low-tech, affordable remedies to our world's water crisis. With economies in the tank all around the world, we need to keep costs in the forefront of our minds when creating the solutions we so desperately need. For more info: BBC News

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