In our universe, fundamental processes involving electromagnetism, gravity, and nuclear force do not distinguish between left and right. It’s led to something called The Ozma Problem, a problem of how to convey left from right if we were ever to communicate with life on another planet.

Luckily, the weak force which governs processes in nuclear physics enables antimatter to be distinguished from matter, which can help solve this problem. A new video, supported by the Science program and produced by Minute Physics, explains how it all works.