Why We Need a Toilet Revolution
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Four out of 10 people worldwide don't have a safe way to poop. Find out why we need a toilet revolution. We need new ideas to help reduce disease and find new ways to turn crap into valuable stuff, like fuel, fertilizer, and fresh water.
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Read previous versions of the Annual Letter
An update on the machine that turns feces into water.
A photo gallery that shows why better sanitation is so important.
This machine turns feces into water and electricity—and may save lives.
To address a health crisis, India, hosted a Reinvent the Toilet fair.
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