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swimming as a sperm does

It's much harder for a sperm to swim, than it is for a sperm whale. Why? This excellent TEDed video explains: 

I think I'll use it next year, during the 'reproduction' section of my first-year biology paper :)

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Purcell's paper is a really good read. The key from a physics point of view is breaking time-reversal symmetry. http://sci.waikato.ac.nz/physicsstop/2009/01/yet-more-swimming-pool-physics.shtml

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