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Because we had better food, our brains grew bigger than those of our primate cousins, scientists say. Early humans cooked, which makes meat and veggies more digestible and nutrients more available to the body. Plus, there was all that chatting and chewing around the campfire.

Content in the free online encyclopedia Wikipedia can be generated and edited by anyone. But the power to delete or lock those entries lies in the hands of the site's "administrators." A rigorous screening process for new administrators has partly led to a drop in site participation. Now, Wikipedia is struggling to find new editors.

Aurora is the third-largest city in Colorado, but it's probably not one many people had heard of prior to Friday's massacre that left 12 dead and dozens more injured. Residents are reflecting on what the shootings mean for their city during a summer that already had been less than quiet.

Black high school students are engaging in risky sexual behavior far less often than they were 20 years ago, a study found. But their condom use is also dropping, leading some to worry that HIV rates within the black community may not go down.

Weekend Edition is answering your questions about issues and candidates. This week, we address inquiries about foreign policy and U.S. involvement in the Middle East and Afghanistan.

Scientists have partially decoded the genetic sequence of a new virus, which has killed one man and hospitalized another. Advances in sequencing technologies have helped health workers rapidly respond to the virus in ways that they couldn't during the SARS epidemic of 2002.

The network pushed Obama's connections with the controversial Rev. Jeremiah Wright into the presidential campaign.

Passionate advocates believe that squatting over the toilet is a more healthful position than sitting down on one. They say the posture can alleviate problems like hemorrhoids. One company is making stools to help people get closer to the squat.

Mitt Romney said that pre-existing conditions would be covered under his health care plan. But his plan wouldn't guarantee that people who don't have coverage now will be able to buy it.

Both the Romney and Obama campaigns agreed to a laundry list of rules for the debates. That "Memorandum of Understanding" is 21 pages long and covers everything from air conditioning to props. Whether the candidates obey the rules is another story.