Scientists invent foam that can stop a bullet as well as steel can

When designing armor capable of stopping a bullet, the two most important factors are weight and resistance to penetration, and they're often at odds with one another. A thick steel plate can stop many projectiles but at some point the weight becomes impractical for most applications. Now, new research into a novel type of material is showing promise as both an option for powerful protection and a weight-saving replacement for heavy metal plates. It's a composite metal foam which saves weight bu...