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• How much does St Edward鈥檚 Crown cost?

  Made from 2kg of gold and 444 gemstones, St Edward鈥檚 Crown will feature in the coronation

  Duration: 2:13

• Sesame Street: What is Count von Count's favourite number?

  Revelations from the world of counting from the voice of the Count, the late Jerry Nelson

  Duration: 1:36

• What's the one way to help you cycle faster?

  Aerodynamics expert Bert Blocken explains the numbers behind 'slipstreaming'

  Duration: 2:45

• Harry Potter: How many wizards live among us?

  Clues dropped by JK Rowling, the books and 'amenity ratios' help with the calculation

  Duration: 3:59
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