Non-Newtonian liquids

When something hits a non-Newtonian fluid the liquid will suddenly go extremely hard acting in a non-Newtonian way. When you apply pressure to a non-Newtonian fluid the particles bunch together into patterned regular forms its almost as if it's temporarily turning into a crystal.

These are important because: 

• If a house is built on certain types of clay and an earthquake puts stress on this material through the sudden movement, the apparently solid clay can turn into a runny liquid.
• Body Armour that behaves like a liquid so that you can move easily but turns into a solid on impact from stress could be useful for police or the military.