http://www.ted.com/talks/michael_pritchard_invents_a_water_filter.html http://www.ted.com/talks/michael_pritchard_invents_a_water_f... Pretty amazing when he i

http://www.ted.com/talks/michael_pritchard_invents_a_water_filter.html http://www.ted.com/talks/michael_pritchard_invents_a_water_f... Pretty amazing when he invites the host to drink from a bottle of that filth at the end.