Solving the World's Clean Water Problem for $20 Billion

This video really opened my eyes to the problem of finding clean water in the developing world and after natural disasters which contaminate the fresh water supply.


Check out Michael Pritchard's water filter turns filthy water drinkable on TEDTalks.  (See also on iTunes).  He gives a great demonstration how his invention cleans disgusting water from contaminants by drinking the purified water himself and offering it to someone else.  Very convincing.  He claims all the poor of the world could have clean water for a meer $20 billion.