This video is in collaboration with Bill and Melinda Gates. You can check out the Gates Annual Letter here: Doctors beat back a disease that was killing tens of thousands of babies a year with a machine based on a simple principle of physics.
Aired February 14, 2017
- Recommended Recommended
- History & In Progress History
- Browse Library
- Most Popular Library
Get Personalized Recommendations
Let us help you figure out what to learn! By taking a short interview you’ll be able to specify your learning interests and goals, so we can recommend the perfect courses and lessons to try next.Start Interview
You don't have any lessons in your history.
Just find something that looks interesting and start learning!