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)