This week would have been the 100th birthday of Martin Gardner, who is deservedly credited with turning on several generations of people worldwide to the pleasures of maths! To mark the occasion here are some favourite puzzles that, apart from being fun, also lead to some serious maths.

It might not be as familiar as the circle or parabola, but it's definitely worth getting to know the hyperbola!

If you like to have your mind blown cosmology is a great field to go into. But is it science?

Could the world be simpler than our senses suggest?

What gives an equation the right to call itself a law?

What makes a number a constant of nature?

Why cosmologists worry about isolated brains that randomly fluctuate into existence.

George Ellis explains why the study of the cosmos poses some very deep questions.