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And even more: http://netlib.bell-labs.com/cm/cs/pearls/sec0510.html http://netlib.bell-labs.com/cm/cs/pearls/sec0510.html http://discovermagazine.com/2012/jul-aug/06-vital-signs-woman-needed-upside-down/article_print http://discovermagazine.com/2012/jul-aug/06-vital-signs-woma...