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The world's first female spacewalking team made history high above Earth on Friday, floating out of the International Space Station to fix a broken part of the power network.

"Case fatality rates have been very confusing," says Dr. Steven Lawrence, an infectious disease expert. Here's why.

Journalist Steven Levy's rich history of the social network traces Facebook's cascading crises to the worldview and early decisions of its founder, Mark Zuckerberg.

The U.S. adds more jobs in January, coronavirus concerns blunt an otherwise strong week for stocks, Macy's announces store closures and San Diego launches a new tourism campaign.

Some parents, particularly moms, are stepping back from the workforce, while others are turning to in-home day cares and "pandemic pods."

The three whales — named Ace, Ava and Piper — are the only surviving victims of a 2012 mass stranding near Fort Pierce, Florida, according to the theme park.

Last-minute objections are holding up a massive aid package that Trump says he will sign.

The latest installment in Pullman's Book of Dust trilogy finds beloved heroine Lyra grown up and troubled, at odds with her daemon Pan and in danger from the plots swirling around her.

Dr. Danielle Ofri says medical errors are more common than most people realize: "If we don't talk about the emotions that keep doctors and nurses from speaking up, we'll never solve this problem."

Facebook, Google and other tech giants have been hit with problems they didn't anticipate their software creating. An MIT professor is teaching students that ethics is essential to their future work.