"Take sexual reproduction itself. The reason we may even have two sexes,
as opposed to just one gender that self-duplicates, is that constantly
shuffling our genomes helps us stay ahead of the many parasites and
pathogens eager to suck us dry. Sex guarantees the genetic diversity
necessary to persevere in a never-ending war, meaning that you can thank
disease-causing microbes and parasites for the opportunity to fall in
love at all."
--"Microbes, a Love Story," by Moises Velasquez-Manoff, The New York Times
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