Non-Newtonian fluids are usually liquid, but when force is applied they can change to be more solid or more liquid. Oobleck (a mixture of cornstarch and water) looks and behaves like a liquid, but you can walk over it as if you were walking on water.

François Boucher [Public domain], via Wikimedia Commons
Categories: Physics & chemistry Sciences
The Generalist
I live in Auckland, New Zealand, and am curious about most things.
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