In a Horizon documentary made for the BBC in 2009, comedian and professional dunce Alan Davies set out to measure a piece of string he bought in a hardware shop. After meeting a series of pompous and condescending experts he decided it's an impossible task. According to the mathematician his string may be of infinite length, while the physicists tell him that until he goes about measuring it, it actually has no length (the observer effect).
Its an interesting exercise which brings together branches of natural sciences, maths and philosophy.
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