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A new study suggests big sisters have a powerful impact. (Sorry, big brothers, you don't make as much of a difference.) But there are also potential downsides for the sisters.

With surgical care on the rise globally, researchers worry the energy-consuming procedures will have a negative impact on the climate. But they say there are ways to make them more energy efficient.

The reprieve in the latest sigh of relief for the massively popular video app, but uncertainty hangs over its future.

Critics accuse the luxury hotel chain owned by billionaire Robert B. Rowling of taking money that could have helped small businesses or other companies that might have used it to pay their workers.

There are two schools of thought: either the right to abortion will be systemically hollowed out, leaving it a right on paper only, or Roe will be overturned.

Armed with pro-Trump banners, the rioters far outnumbered and swiftly overwhelmed the Capitol Police as they charged up the steps, smashed windows, broke into the Senate chamber and occupied offices.

The riot appeared to be all chaos and anarchy. But as researchers gave the online video and photos closer scrutiny, they produced forensic evidence that has identified those involved.

We hear from young political organizers from two battleground states, Hayden Padgett of Texas and Helen Clanaugh of Minnesota, about what this election means to them.

In the '70s, Dr. Herbert Needleman made a discovery that changed how people think about lead. His work led to a ban on lead in gasoline. But as seen in Flint, Mich., lead poisoning is still a concern.

They have provided physical evidence to a famous story of heroism during the Holocaust — known before only through the testimony of the 11 Jews who escaped a Lithuanian massacre site.