Puzzle 1: You are given nine gold coins that look identical. You are told that one of them is fake, and that this coin weighs ...

This holiday-themed brainteaser looks simple, but it's quietly tripping up adults everywhere. A math teacher walks us through ...

It's supposed to be a simple maths puzzle - but it's left many scratching their heads. Physical fitness and mental health are two sides of the same coin. To keep your brain in tip-top condition, it's ...