A journey into the maths of card shuffling gives us a great insight into how mathematicians work.

In time for pancake day here's a problem about flipping pancakes. It turns out to be surprisingly hard.

Genes normally evolve by tiny mutations, but every now and then something more radical occurs and entire genes along a chromosome get flipped. Understanding gene flipping boils down to solving a problem from pure maths. Colva Roney-Dougal and Vincent Vatter explain, taking us on a journey from waiters sorting pancakes, via one of the richest men in the world, to the genetic similarities of mice and humans.