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By our third year, most of us will have learned to count. Once we know how, it seems as if there would be nothing to stop us counting forever. But, while infinity might seem like an perfectly innocent idea, keep counting and you enter a paradoxical world where nothing is as it seems.
Channel: BBC (Archive)
First Air Date: 10 Feb 2010
Duration: 60 mins
Collection: 50 Years of Horizon (15 episodes)
A collection of programmes specially chosen to celebrate Horizon's 50th anniversary.