Plus Advent Calendar Door #7: What's your favourite number?

What's your favourite number? If it's 7 then you're not alone. Alex Bellos, one of our favourite maths authors, conducted a survey this year to find the world's favourite number. After polling more than 30,000 people from around the world, he found that the winner was ... 7!

To find out more about the poll, see favouritenumber.net or read Alex's book Alex through the looking glass. We also highly recommend Alex's adventures in number land.

Happy reading!

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