Nits: been around for ages, and annoyingly here to stay

The ancient Pediculus humanus capitis, otherwise known as the humble nit, was likely infesting the hair of our pre-hominid ancestor and has been identified on human hair dating back to 8000 BC in Brazil, on 10,000-year-old Peruvian mummies and on a 9000-year-old corpse in Israel.

Now researchers are uncovering puzzling evidence of the evolutionary distribution of head lice after identifying two genotypes, clade A and clade B, existing in sympatry in two nits isolated on the hair of one of seven mummies excavated in Chile