Each year SU does this thing called 'Mayfest', where they give the students a day off and have a bunch of different demonstrations all over campus. One of the physics demonstrations this year was about Non-Newtonian fluids. The basic idea being that the viscosity of a non-Newtonian fluid changes with the applied strain rate. The faster and harder you hit it, the harder it is. So if you run on top of the fluid, you stay on top, but if you stand still, you sink. It's pretty cool, and easy to make, since you can make a non-Newtonian fluid out of cornstarch and water.
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