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The maths of February 29

Find out why leap years exist, why you have to wait 400 years for your birthday pattern to repeat, and why there are so many Fridays falling on a 13th.
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What are sigma levels?

Find out how scientists, from physicists to geneticists, measure their confidence in their results.
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It from bit?

Does reality arise from information? What does this even mean? Anton Zeilinger explains the impact of John Wheeler's radical idea.
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Reality's neverending story

In The Neverending Story a little boy named Bastian discovers that there's something extraordinary about the book he's smuggled into his backpack: it changes as he reads it. The act of reading "The Neverending Story" Bastian finds, is simultaneously the act of writing it. Could our universe be in a similar loop?
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Analysing Ada

Ada Lovelace, born 200 years ago this month, is hailed the world's first computer programmer. What exactly was her contribution to computer science?