TED-Ed

View full lesson: http://ed.ted.com/lessons/why-is-ketchup-so-hard-to-pour-george-zaidan 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 non-Newtonian fluids can suddenly transition from solid to liquid and back again. Lesson by George Zaidan, animation by TOGETHER.