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- Currently playing : Programme 4: The Bagel The bagel, or torus, is not merely a good shape for baking. As marcus discovers its also a good shape for office complexes, codebreaking and maybe even universes. MArcus this week discovers that, as one of the simplest building bloc
- URL http://www.bbc.co.uk/radio4/science/rams/fiveshapes_20040928.ram
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