President Obama speaks at Ellicott Dredges in Baltimore on May 17. The trip followed a visit by the company's president to Capitol Hill to testify in support of the Keystone XL pipeline. The White House says Obama's speech had nothing to do with Keystone, but environmental groups have been frustrated with his stance on the issue.
NPR continues its conversations about The Race Card Project, where NPR Host/Special Correspondent Michele Norris asks people to send in six-word stories about race and culture. The submissions are personal, provocative and often quite candid.
Prison is a tough place, but Congress made an exception nearly 30 years ago, giving terminally ill inmates and prisoners with extraordinary family circumstances an early way out. It's called compassionate release.
But a recent investigation found that many federal inmates actually die while their requests drift through the system.
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.