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Horizon – Alan Davies asks “How long is a piece of string?”

An encounter with leading mathematician Marcus du Sautoy reveals that Alan’s short length of string may in fact be infinitely long. When Alan attempts to measure his string at the atomic scale, events take an even stranger turn.

Ultimately, Alan finds that measuring his piece of string could – in theory at least – create a black hole, bringing about the end of the world.

Only 21 days left on iplayer!

http://www.bbc.co.uk/programmes/b00p1fpc

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