Meet the algebra at the heart of your computer!

Modern computers wouldn't be possible without George Boole, who died before light bulbs even came on the market. We celebrate his 200th birthday with a look at the man and his work.

If you like mathematics because things are either true or false, then you'll be worried to hear that in some quarters this basic concept is hotly disputed. In this article Phil Wilson looks at constructivist mathematics, which holds that some things are neither true, nor false, nor anything in between.