Christmas: How to win at crackers

Have you ever wondered how to win at Christmas crackers?

Well a combination of science and maths means that you can win every time you pull one during the festive season.

It's worth mentioning though that you're on your own when it comes to stopping your hat, joke or key-ring falling in your gravy!

Dr Hannah Fry and CBBCs Fran Scott explain what it's all about.