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Our changing picture of gravity

To celebrate the recent centenary of the first major test of Einstein's general theory of relativity, we look back over how our picture of gravity has changed.
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The PEMDAS Paradox

It looks trivial but it keeps going viral. What answer do you get when you calculate 6÷ 2(1+2)? David Linkletter explains the source of the confusion.

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Mysterious 6174

Start with your favourite four-digit number, follow these simple steps, and you'll never guess what happens next!
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The power of snooker

In preparation for this year's snooker world championship, Wim Hordijk finds some powerful maths behind snooker statistics...
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David Berman

A geometry for strings

If, as string theory suggests, the world is made of strings, then what does that mean for a geometry of points? Find out more in this video.