Crooked Teeth? Blame Early Farmers
When humans turned from hunting and gathering to farming some 10,000 years ago, they set our species on the road to civilization. Agricultural surpluses led to division of labor, the rise of cities, and technological innovation. But civilization has had both its blessings and its curses. One downside of farming, a new study demonstrates, was a shortening of the human jaw that has left precious little room for our teeth and sends many of us to an orthodontist's chair.
Although all living humans belong to one species, Homo sapiens, there are recognizable differences in the shapes of our skulls and faces across the world. In recent years, anthropologists have concluded that most of this geographic variation in skull shape is due to chance, so-called genetic drift, rather than natural selection. But some features of our faces, including the shape of our lower jaws, don't seem to follow this random pattern....
comments powered by Disqus
- Here's a look at history of 'religious freedom' laws
- ‘Hamilton’ Puts Politics Onstage and Politicians in Attendance
- Earth Tectonic Plate Simulation Reveals Our Planet Has Changed A Lot In 200 Million Years
- For G.O.P., Support for Israel Becomes New Litmus Test
- Yale’s Beinecke Library Buys Vast Collection of Lincoln Photos
- History's Grandin Wins Bancroft Prize for "The Empire of Necessity"
- Nobel prize-winning scientist writes a history of science
- Ken Burns tackles history of cancer
- If historians have their way, Americans will soon learn how important religion has been in US history
- Role-playing history game gets students jazzed