You'll need to be one of the smartest 15% in the country to answer this maths question correctly. Brainteasers and other puzzles are a fantastic way to make sure you keep your mind in tip-top shape, ...

Find one million consecutive positive numbers, none of which are prime. Ancient math tells us that prime numbers (2, 3, 5, 7, 11, ...,), which have no factors except for 1 and themselves, go on ...