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Understanding Vaccination: The Cold Chain
Let's dig in to this slightly geeky technical problem—one that literally means the difference between life and death.
GATES FOUNDATION
The Recipe for Fake Poop
Toilet-inventors need fake poop for testing. So, uh...what's in the fake poop?
Meet PoopGuy, India's Toilet Hero
In a place where one toilet can serve 1,000 people every day, keeping things clean is a serious challenge.
Meet Raya, the Sanitation Muppet
The latest Sesame Street Muppet was unveiled this Wednesday. Her name is Raya, and she's a 6-year old green monster. Raya will appear as part of Sesame Street's Cleaner, Healthier, Happier campaign in Bangladesh, India, and Nigeria. And she has a message:
