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The votes are in! Here are our most popular posts from 2021, including news, activities and brainteasers. There’s sure to be something here to tickle your fancy!

Blenders mix milk and chocolate topping. Cereal makers add sultanas and puffs to bran flakes. We all mix things every day, but we know surprisingly little about the mathematics of mixing. One of this year’s Fields Medallists is working to bridge this gap. Many people can shuffle cards, but Artur Avila can shuffle a line.