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If you've ever looked upon sperm as a little army of white-coated soldiers setting off to sack and pillage a barely pregnable fortress . . . well, you'd be right, according to this fascinating new book. Dr. Robin Baker, who has studied sperm and cervical mucus in much greater detail than anyone would've thought necessary, has come to some startling conclusions: that less than 1 percent of sperm is actually designed to fertilize an egg (the rest are there to block other men's sperm), and that 4 to 10 percent of all children born to married couples are in fact the offspring of other men, usually of higher socioeconomic status, with whom the mother had a short-term relationship. [via]