Head lice are "a psychological, emotional problem” more than they are a medical concern, one expert told Daniel Engber. He writes about the unending battle humans have to face against the bug that’s programmed to get up to our heads:

Head lice are "a psychological, emotional problem” more than they are a medical concern, one expert told Daniel Engber. He writes about the unending battle humans have to face against the bug that’s programmed to get up to our heads:

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