They 've been working on an invention they say can tap into 97 percent of the world 's undrinkable water . Segway inventor David Kamen wants to solve the world 's fresh water shortage . Kamen has designed a portable water purifying machine called a Slingshot . The machine is designed to provide water in remote areas of developing nations . But assembly costs remain too high for the machine to be mass produced .
Segway inventor David Kamen wants to solve the world 's fresh water shortage . Kamen has designed a portable water purifying machine called a Slingshot . The machine is designed to provide water in remote areas of developing nations . But assembly costs remain too high for the machine to be mass produced .