Thus the Microsoft founder was in the Chinese capital to launch the three-day "Reinvented Toilet Expo", which showcased new dunny tech meant to stop disease spreading.
"I have to say, a decade ago I never imagined that I'd know so much about poop", Gates told the crowd during the opening plenary.
The toilet, which is the brainchild of research projects funded by the Bill and Melinda Gates Foundation, is ready for sale after years of development.
According to Gates, exposure to waste causes "diarrhea, cholera, and typhoid that kill almost 500,000 children each year" and billions across the globe don't have access to the type of sanitation facilities we consider routine in America.
"The current toilet simply sends the waste away in the water, whereas these toilets don't have the sewer". So these toilets internalize the sewage treatment process and turn human waste into drinking water, agricultural fertilizer, or even energy-one proposed design turns human waste into hydrogen and then stores it in hydrogen fuel cells.
Gates' foundation has committed about $200 million to the toilet project and expects to spend the same amount again before the toilets are viable for wide-scale distribution.
'In the way that a personal computer is sort of self-contained, not a very big thing, we can do this chemical processing at the household level, ' he said.
'This year the volume of toilets will literally be in the 100s while people are still kicking tyres (testing them),' Gates said.
Bill Gates' obsession with all things faecal continued apace on Tuesday as the billionaire philanthropist took to a Beijing stage armed only with a fierce determination to improve global sanitation.
It is the first time Gates' foundation has addressed an event in China, where President Xi Jinping is promoting a three-year "toilet revolution" to build or upgrade 64,000 public toilets by 2020 to help boost tourism and economic growth. "20 billion Shigella bacteria, and 100,000 parasitic worm eggs".
The former Microsoft chief executive said the next step for the project is to pitch the concept to manufacturers, adding he expects the market for the toilets to be more than $6bn (£4.5bn) by 2030.