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In a landmark report, the world's top climate scientists are warning that Earth is headed toward unprecedented warming. Preventing the worst effects will demand a U-turn away from use of fossil fuels.

In the past week, Alcaraz turned 19 — and then outplayed three of the world's top five players.

The swine flu virus has spread to at least 20 countries. Experts are now worried that pigs may start to get infected by humans with the virus. Top health officials are expecting a flu pandemic.

President Obama unveiled his budget for 2010 on Thursday. Democrats praised the president's commitment to expanding health care coverage, education funding and clean energy. Republicans were skeptical — especially about plans to raise taxes on businesses and wealthy households.

Dorie Greenspan struggled to recreate a friend's sweet dessert, but he just wouldn't divulge his secret. "It's nothing," he said. "It's so simple." Turns out, it is simple — once you have the recipe.

Democrats and Republicans are going to the brink over tax cuts for the wealthiest Americans in a showdown that threatens to send the U.S. over a year-end "fiscal cliff." So what's at the heart of the impasse?

NPR's Ari Shapiro talks with Justin Williams, a staff writer at The Athletic, about what to look out for when the NCAA basketball tournament starts Tuesday.

Election analysts say Washington state’s August primary, open to all voters and sending the top two candidates to the general election, acts as a “dress rehearsal” for how voters may feel in November.

Jessica Pegula and Aryna Sabalenka will play Saturday for the championship. The men's field will be narrowed to two players on Friday.

The world's tennis greats are facing off at Wimbledon. Howard Bryant of ESPN is there and tells NPR's Eric Westervelt what's been happening on the grass courts.