Having lice ain't nice. But they tell our story, concise and precise
A new study shows how the annoying little louse has hitchhiked around the world with humans and has much to teach us about history.
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 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 heirlooms of our past," says , an evolutionary geneticist at the U.S. Department of Agriculture in
