Student athletes know they need to avoid concussions. But hits that don't cause concussion symptoms can affect the brain, too. Researchers are now trying to figure out who is most at risk from those smaller hits, and if they can be warned in advance.
A congressional vote to renew extended unemployment benefits may have to wait until the new year. Senate Majority Leader Harry Reid will push for it in January if a last-minute extension fails to come together.
California hopes to get 33 percent of its electricity from wind and solar power by 2020. But that will only work if the state can economically store some of the energy for release on cloudy, windless days.