The Ring Nebula, whose iconic shape and large size make it a favorite of amateur astronomers, can now be seen in new detail, after NASA's Hubble Space Telescope captured a sharp image of the nebula. Researchers say the new clarity reveals details that were previously unseen, and a structure that's more complex than scientists believed.
Some economists argue it's time to rethink restrictions on incentives for blood donors. In the last few years there have been some real-world experiments with incentives that suggest they can help increase donations without causing trouble.
They were just little girls when they were killed in what came to be known as the 16th Street Baptist Church Bombing. And now Addie Mae Collins, Denise McNair, Carole Robertson, and Cynthia Wesley have been awarded the Congressional Gold Medal, nearly 50 years after the attack in Birmingham, Ala.