Horizon
Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
Season 47 · Episode 6 ·
How Long is a Piece of String?
Alan Davies attempts to answer the proverbial question: how long is a piece of string? But what appears to be a simple task soon turns into a mind-bending voyage of discovery where nothing is as it seems.
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Episode 6 of season 47 of Horizon: “How Long is a Piece of String?”. Aired 2009-11-17. Watch it online free on ZapFlix.