[john70t]

https://auto.howstuffworks.com/fuel-efficiency/vehicles/micro-lattice-metal.htm
"It can be compressed to half its volume and it'll spring right back to its original shape.

This could potentially revolutionize car manufacturing. Picture it: A car body lighter than the same design made of Styrofoam, yet able to absorb an impact and return to its proper form. Lighter cars mean less drag and better fuel efficiency, and the ability to absorb so much energy is an obvious safety plus, too. Parking lot door dings would be a thing of the past."