London: Since the turn of the century, one of the standing puzzles has been how human fertilisation actually takes place. Now, British scientists claim to have finally solved the puzzle -- sperms have an appalling sense of direction, crashing into walls and each other in the race to reach the egg, the `Daily Mail` reported. On an average, a man releases 300 to 500 million sperm during sex with his female partner, but usually only one sperm enters into her egg. In their study, the scientists from the University of Warwick and University of Birmingham have found that sperms avoid the "middle lane" of the female reproductive tract and instead crawl along the channel walls.
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