Probability is everywhere, and Bobby and Susan are here to prove it. From the weather, to the national lottery, with dice-throwing in between, the two discuss teaching probability and common pitfalls students face. This week's guest is Simon Singh, maths champion and science author. He chats to Susan about maths education and his favourite maths apps and online resources. Oh, and Bobby's puzzle is a thing of joy. This time it's about breakfast.

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