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Head lice. Fossils can tell us a lot about human evolution, but still leave many questions unanswered. After sucking our blood for millions of years, lice are suddenly proving their value: Their DNA turns out to hold a treasure trove of clues about our evolution.

Above: Head lice. Fossils can tell us a lot about human evolution, but still leave many questions unanswered. After sucking our blood for millions of years, lice are suddenly proving their value: Their DNA turns out to hold a treasure trove of clues about our evolution.