These people are "walking on water"
What's really happening here?
The substance is a mix of water and cornstarch. The mixture is two parts cornstarch to one part water. It demonstrates the properties of non-Newtonian fluids. Non-Newtonian fluids are solid if you apply a sudden force. and liquid if you apply a steady, slow force.
How can something be a solid and a liquid?
In the mix, there are tiny cornstarch particles evenly distributed.
When a steady, slow force is applied... the particles have time to move. So the object slides through, as it would in a liquid.
When a sudden force is applied... the particles don't have time to move out of the way. So the object stops, as it would on a solid surface.
What makes non-Newtonian fluids unique is viscosity.
Viscosity is the rate at which fluid flows. Common fluids, like water, have a consistent viscosity.
So they flow the same regardless of what force you apply.
In non-Newtonian fluids, viscosity can change.
Apply a sudden force, and the viscosity rapidly increases, forming a semisolid surface.
What can you do on a non-Newtonian fluid pool?
Jump. Bike. Flip.
Whatever you do, just keep applying high force.
Or you'll sink right in.
Read more: http://www.businessinsider.com/sai