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Roller derby teams had distinct bacterial colonies on their arms before a bout, researchers found. After pushing and shoving on the track, those colonies were more similar. The research is part of the push to identify the microbes that live on (and in) us.

James Holmes faces 166 counts, including murder, in the shooting deaths of 12 people and wounding of another 70. His attorneys said they aren't yet ready to make a plea, so the judge did it for Holmes.

Americans expect a lot from the president — any president. Modern presidents are believed to control the economy, when the reality is that they have fewer tools even to control Congress or public opinion.

The photograph of a grieving father holding the body of his baby boy became the iconic photograph of Israel's military strikes in Gaza last November.

Facebook COO Sheryl Sandberg has drawn a lot of attention with her "sort of a feminist manifesto" Lean In. Critic Maureen Corrigan finds that much of the book is bland, but toward the end, Sandberg's intellectual charisma breaks through.

Spaghetti Westerns, Philadelphia soul, opera and the Wu-Tang Clan all come together in the music of Adrian Younge. He has produced and composed two new albums — one with William Hart, the lead singer of The Delfonics, and another with rapper Ghostface Killah.

Drilling into some Mars rock, the rover found sulfur, nitrogen, hydrogen, oxygen, phosphorus and carbon — key ingredients for life.

Nearly 200 smaller airports, including Arnold Palmer Regional Airport in Latrobe, Pa., are set to have their control towers closed this year as the FAA makes sequestration cuts. Although commercial flights will continue, some say safety is a concern.

Rep. Paul Ryan's budget plan would repeal the Affordable Care Act. But the 2012 vice presidential nominee's dislike of the health care law doesn't appear to extend to the $800 billion in new taxes it raises over the next decade.

For commentator Frank Deford, it seems unfair that students who pursue other extracurricular talents — like music — should be placed in a subsidiary position to their classmates who happen to play sports.