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This week, a group of Iraq and Afghanistan war veterans, many with disabilities, marked Sept. 11 by climbing two peaks in Yosemite National Park. Climbing as a team, they say, gives them an opportunity to recapture what they miss about the military: a sense of camaraderie with a shared challenge.

Louisiana officials say they identified for the first time a dangerous form of amoeba in a municipal water supply. It was found after a 4-year-old boy died of a brain infection caused by the amoeba. They say this may make it easier to diagnose cases of encephalitis with unknown causes.

GOP Sen. Thad Cochran faces a tough runoff election against challenger Chris McDaniel, a Tea Party-backed state senator. Mississippi voters will decide whether Cochran gets a chance at a seventh term.

Cops worldwide are getting savvy about social media, branching out beyond Facebook to solve everything from murder cases to thefts.

Officials are trying to protect fire-prone areas by targeting the grasses, brush and trees that fires feed off of. But until recently, conditions for controlled burning have been too dangerous.

With murders down dramatically, death penalty support has fallen far from its peak 20 years ago. Problems with executions, meanwhile, have made many Democrats, at least, skeptical about the practice.

In the past five years, the conflict in Syria has helped dramatically change the profile of a jihadi fighter: No longer are jihadi groups forced to meet in secret forums; instead, they're openly on Facebook, and the movement is democratizing.

Opponents of a new California law that aims to accommodate transgender students say they've gathered enough signatures to try to overturn it on next year's ballot. The law allows transgender students to use the bathrooms and join the sports teams that match their gender identity.

After a decade of kicking the ball down the road, Congress appears ready to repeal its payment formula for Medicare and replace it with a whole new system. This time, doctors would be paid according to the quality of results they produce, rather than the number of services they provide.

The State Department on Tuesday advised all U.S. citizens to leave Yemen because of "extremely high" danger there. This comes as 19 U.S. embassies and consulates remain closed across much of the Middle East and Africa because of a security threat. Al-Qaida chatter picked up by intelligence sources suggested a major attack was in the works.