View full lesson: http://ed.ted.com/lessons/why-do-we-pass-gas-purna-kashyap

Flatulence is a daily phenomenon. In fact, most human beings pass gas 10-20 times a day (yes, that includes you). Where does your bodily gas come from? Purna Kashyap takes us on a journey into the intestines, shedding light on how gas is made, which foods contribute most to its production...and why it stinks.

Lesson by Purna Kashyap, animation by Ace & Son Moving Picture Co., LLC.