Head lice are considered a nuisance — a pest to be evicted from the hair on your head or the head of a loved one with a special comb or shampoo. But there's more to lice than their elimination. These ...

But there's more to lice than their elimination. These parasites have been stowaways on our heads for so long that they've recorded our history as humans in their DNA. "We can think of human lice as ...

But there's more to lice than their elimination. These parasites have been stowaways on our heads for so long that they've recorded our history as humans in their DNA. "We can think of human lice ...