MIT Makes A Water Filter From The Sapwood In Tree Branches

Boy scouts know this, and now we'll let you in on a secret too: if you've run out of drinking water during a lakeside camping trip, there's a simple solution. Break off a branch from the nearest pine tree, peel away the bark, and slowly pour lake water through the stick. This improvised filter will trap any bacteria, producing fresh, uncontaminated water.  An MIT team has discovered that this low-tech filtration system can produce up to four liters of drinking water a day — enough to quench the thirst of a typical person.  read more

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