How many ways can you arrange a deck of cards? – Yannay Khaikin

Pick a card, any card. Actually, just pick up all of them and take a look. This standard 52-card deck has been used for centuries. Everyday, thousands just like it are shuffled in casinos all over the world, the order rearranged each time. And yet, every time you pick up a well-shuffled deck like this […]

The mathematics of love | Hannah Fry

Today I want to talk to you about the mathematics of love. Now, I think that we can all agree that mathematicians are famously excellent at finding love. (Laughter) But it’s not just because of our dashing personalities, superior conversational skills and excellent pencil cases. It’s also because we’ve actually done an awful lot of […]

Can You Solve The Marriage Logic Problem? 80% Fail

Hey, this is Presh Talwalkar. Surveys have found that eighty percent of people get this problem wrong. While you are thinking about it I am going to present a similar problem. Give these problems a try and when you’re ready keep watching the video for the solution. Many people think that the answer to the […]

Is time travel possible? Brian Cox and Nalini Joshi offer their views | Q & A