Credit Ian Harrowell, Christine Austin, Manish Arora / Harvard School of Public Health
This model of a molar shows color-coded barium banding patterns that reveal weaning age.
Credit Alyson Hurt, Adam Cole / NPR / Christine Austin / Westmead Centre for Oral Health
Top: Lines on a 100,000-year-old Neanderthal tooth mark the passage of time. Bottom: The distribution of barium shows dietary transition: low barium before birth (1), high barium during breast-feeding (2) and falling barium as the Neanderthal transitions to a mixed diet (3).
Our closest relatives, chimpanzees and gorillas, breast-feed their offspring for several years. Some baby orangutans nurse until they are 7 years old.
But modern humans wean much earlier. In preindustrial societies, babies stop nursing after about two years. Which raises the question: How did we get that way? When did we make the evolutionary shift from apelike parenting to the short breast-feeding period of humans?
A British driver who struck a cyclist with her car — and who then bragged about the incident on Twitter — has issued an apology. The incident caused an uproar after the collision Sunday.
"Definitely knocked a cyclist off his bike earlier - I have right of way he doesn't even pay road tax! #bloodycyclist," tweeted Emma Way, in a message that has been widely circulated despite her apparent attempts to delete it, and seemingly her Twitter account, @EmmaWay20.
"I'm shocked by the optimism here," Howard Yana-Shapiro, the chief agricultural officer for Mars Inc. said Tuesday to the audience of the Chicago Council on Global Affairs' Global Food Security Symposium in Washington, D.C.
Seated there before him were some of the leaders from the wealthiest international organizations and multinational companies of the fight to end hunger. And Shapiro told them they weren't even close.
Chuck used to sell marijuana in California. But the legalization of medical marijuana in the state meant he was suddenly competing against hundreds of marijuana dispensaries. So he moved to New York, where marijuana is still 100 percent illegal. Since making the move, he says, he's quadrupled his income. (For the record: His name isn't really Chuck.)