Cyber security is vital in our modern digital world, but it's not ruled entirely by traditional computing techniques. In fact, it's learning from the natural world—and something called The Danger Theory could help keep our computers safe.

In fact, The Danger Theory is really quite new itself—a piece of cutting edge immunology which explains how the human body identifies true infection risk—but now its being used computationally to help networks identify threats, too. Here, Dr Julie Greensmith explains how it works. Brace yourself! [Computerphile]