Additionally, the DNA differences between head lice and body lice provide corroborating evidence that humans used clothing between 80, 000 and 170, 000 years ago, before leaving Africa.
32.
Human body lice, once a great scourge, are now a minor pest due to widespread delousing of soldiers and prisoners in the 20th century and eradication efforts in public schools.
33.
For months last year, another resident had a blank file even though he refused medication, had body lice and had smeared rotting food on his room's walls and furniture.
34.
Because body lice require clothing to survive, the divergence of head and body lice from their common ancestor provides an estimate of the date of introduction of clothing in human evolutionary history.
35.
Because body lice require clothing to survive, the divergence of head and body lice from their common ancestor provides an estimate of the date of introduction of clothing in human evolutionary history.
36.
Delphinine is the principal alkaloid found in " Delphinium staphisagria " seeds at one time, under the name stavesacre, a very well known herbal treatment for body lice.
37.
Human head and body lice ( genus " Pediculus " ) share a common ancestor with chimpanzee lice, while pubic lice ( genus " Phthirus " ) share a common ancestor with gorilla lice.
38.
Ralf Kittler, Manfred Kayser and Mark Stoneking, anthropologists at the Max Planck Institute for Evolutionary Anthropology, have conducted a genetic analysis of human body lice that suggests clothing originated quite recently, around 170, 000 years ago.
39.
Stoneking and his team announced an interesting discovery in 2003 on the evolution of body lice, along with a chimpanzee louse revealed that human started to wear clothes some 72, 000 years ago ( give or take 42, 000 years ).
40.
For example, while most specialists believe head lice don't present a health threat, a small but persistent coalition argues that head lice possess some of the disease-propagating potential of their cousins, body lice, long known to spread typhus.
