View full lesson: http://ed.ted.com/lessons/whyisketc...

Ever go to pour ketchup on your fries...and nothing comes out? Or the opposite happens, and your plate is suddenly swimming in a sea of red? George Zaidan describes the physics behind this frustrating phenomenon, explaining how ketchup and other nonNewtonian fluids can suddenly transition from solid to liquid and back again.

Lesson by George Zaidan, animation by TOGETHER.