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During astronaut Scott Kelly's year in space, scientists will compare his physiology with that of his twin brother, Mark, to study the effect of prolonged space flight on the human body.

The Duesseldorf prosecutor also said torn-up sick notes for the day of the crash supported that "preliminary assessment." He did not say what the illness was. Tuesday's crash killed 150 people.

There are questionnaires that aim to identify people at risk of killing themselves. But the tests are flawed — and it's not at all clear they'd be effective in assessing the mental state of pilots.

Primatologist Isabel Behncke Izquierdo explains how bonobos learn by constantly playing. She says play isn't frivolous; it appears to be a critical way to solve problems and avoid conflict.

Why is it so hard to feel empathy for strangers? Because we're stressed by them, says neuroscientist Jeff Mogil. His research suggests one way to reduce that stress: play Rock Band together.

In an effort to connect teenagers with mental health services, New York is testing counseling via text for high school students. They join a growing trend.

A federal grand jury decided there was enough evidence to bring charges against Officer Eric Parker. The incident sparked an international incident.

The Israeli leader ruffled feathers during the bruising campaign. Since then, he has sought to make amends. In the latest move, Israel is handing over money it had withheld from the Palestinians.

President David Boren, releasing an investigation into the incident involving Sigma Alpha Epsilon, contradicts statements by the fraternity's national office that the chant was learned locally.

California Gov. Jerry Brown signed his sweeping $1.1 billion emergency drought relief bill Friday. It funds water infrastructure improvements like flood control and aid for farmworkers.