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Big sperm definitely not fastest Unlike common scientific belief, the space of a sperm’s tail will not always regulate how fast it could swim. Research published on view gain access to journal BMC Evolutionary Biology shows that in the counter-intuitive microscopic world where sperm operate, streamlining and much longer tails don’t always give a speed benefit. Stuart Humphries, from the University of Sheffield, and collaborators from the University of Western Australia possess evaluated the data linking sperm form to swimming acceleration critically. He said, ‘It appears very clear that some assumptions concerning the physics of sperm locomotion possess hampered our improvement in understanding the procedures mediating sperm competition. It really is commonly thought that selection for improved sperm functionality will favor the development of longer, and faster swimming therefore, sperm.