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"If Russia invades, that means tanks or troops crossing the border of Ukraine again, there will no longer be a Nord Stream 2," Biden said, without offering specifics.

The antiviral infusion was just revived as an early treatment for COVID patients. But the drug is relatively expensive and hard to administer, relegating it to what some are calling "stopgap" status.

The Zagat duo, Tim and Nina, put out the latest version of their Zagat Airline Survey today. Small airports and young airlines came out on top. This doesn't provide much hope for those flying out of New York, Los Angeles, Miami or Philadelphia. We'll talk with Nina Zagat about the survey results and which airlines are likely to make your travel experience this holiday a painful one.

Alan Alda played Hawkeye Pierce for 11 years in the television series M*A*S*H and has acted in, written, and directed many films. He has starred on Broadway, and his avid interest in science has led to his hosting PBS's Scientific American Frontiers.

Alex Chadwick chats with legendary comedian, writer and actor Bob Newhart, who will be profiled in a career retrospective airing Wednesday night on PBS.

Swamped by thousands of calls a day, contact tracing programs have been forced to adapt. Even though they can't call everyone, experts say it's too early to give up on this pillar of disease control.

Billions of people rely on glaciers for drinking water, hydropower and irrigation. A raft of new research suggests there is less ice left than previously thought.

The state's ban on nuclear plants was enacted in 1996, but nuclear power has gained support as a tool to keep climate change under control and other states are transitioning away from fossil fuels.

A compilation of Ethel Merman recordings from the '50s, The World is Your Balloon, collects songs she recorded for Decca Records. Few are songs Merman herself made famous.

Sigur Ros, a five-piece band from Iceland, makes spacey progressive music, with often-indecipherable lyrics. Its fourth studio CD is called Takk..., which means "Thanks."