This foam stops bullets cold and pulverizes them to dust
FOAM VS. NUCLEAR RADIATION
The team first produced a foam shield that could block radiation.
This foam is able to stop and block X-rays. In tests, it can even protect against various forms of gamma rays.
According to NASA, gamma rays are produced by the hottest and most energetic objects in the universe like supernova explosions and areas around black holes. Here on Earth, they can also be produced in nuclear fission.
In tests, the foam could also protect against neutron radiation that can be produced by nuclear fission or fusion.
To develop radiation shielding, the team created a "high-Z steel-steel foam". This one is a combination of stainless steel with a small amount of tungsten shaped into hollow spheres. This is then introduced into the steel matrix and creates the foam.
Current protection options tend to be very cumbersome, awkward and heavy. The foam shielding could provide a lightweight, strong alternative for the military. It could also have potential for transportation and storage of hazardous materials.
http://www.foxnews.com/tech/2017/02/23/this-foam-stops-bullets-cold-and-pulverizes-them-to-dust.html