A Danish company has produced a water filter that removes 99 percent of water-borne pathogens. The LifeStraw Personal - which is basically an oversized straw - is small enough to be worn around the neck on a string, requires no power or maintenance, and has no moving parts. As the user dips the straw into water and starts sipping, multiple filters take out disease-causing agents. It is intended for use in Third World countries, as well as places that have been struck by hurricanes, earthquakes, tornados, etc.

(Source: Mental Floss)

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