At the end of a lecture on astronomy, describing how the planets orbit the Sun, a little old lady at the back of the room stood up and said: "What you've told us is all rubbish. The world is really a ...

A simple explanation of dark matter and antimatter, how they differ, how scientists study them, and why both are important to understanding the universe.

There is likely little in the world of physics that is so accurately named yet exotically connotated as matter and antimatter. Matter is simple; it is all the stuff and material that makes up you and ...