I’ve been out of school for decades, and I don’t spend my days solving equations (I’m more of a word person). Still, I like to think I have a solid grip on basic math: I can usually gauge whether a ...

If you fancy yourself as a budding spy, GCHQ’s Christmas challenge will put your analytical skills to the test. The UK spy agency, which sets an annual quiz aimed at children aged between 11 and 18, ...

Add Yahoo as a preferred source to see more of our stories on Google. This is the full card, which you'll need in order to solve the puzzle. If you love testing your mind, then it’s the perfect time ...