Flashback Friday: Chest waxers beware: body hair protects against bedbugs.

Scientists have long speculated about why humans have so little body hair compared with other primates. (The most widely accepted explanation is that less body hair allowed for more efficient cooling on the savannahs where humans evolved.) However, less attention has been paid to the fine coating of hair that we have retained. In this study, the researchers set out to test their hypothesis that our fine body hair serves to defend us against “ectoparasites”–that is, bloodsucking insects like

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