Ketchup, that delicious nectar of a condiment, is more annoying than it should be to pour out and enjoy. Why? Partly because of the dumb bottle it’s in but mostly because it’s a non-newtonian fluid in more than one way. Watch TED-Ed explain why it’s so damn hard to pour out and what you should do instead in this enlightening animation.
It’s not supposed to be that hard to figure out if something is liquid or if something is solid. If it flows like water, it’s liquid. If it stays relatively still, it’s solid. But what if it’s a substance that breaks the laws of normal behavior and is both liquid and solid? Like non-Newtonian fluids?
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