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Coffee beans are filled with oils that emerge from coffee grounds under high pressure. These oils form the crema - "the frothy stuff" on top of an espresso. In the last installment of Science Friday's series on coffee, food-science writer Harold McGee, author of On Food and Cooking, explains the chemistry of crema.

College basketball is just two weeks from its biggest day, Selection Sunday. But with three top-five teams losing this week, it seems nobody can hang onto the No. 1 spot. In the NFL, a potential draftee has reported controversial news from the combine: Teams have asked him about his sexual orientation. Host Scott Simon and Howard Bryant of ESPN.

Pete Buttigieg may face scrutiny after popping in the polls. Elizabeth Warren provided answers about her health care plan, and now she'll have to defend them. And is the field finally set?

Texas Republican Rep. John Ratcliffe assured the Senate Intelligence Committee that, if confirmed, he would not apply a partisan filter to reporting or shade conclusions to please the president.

As Americans think about recession, a pandemic, racial justice, climate change and policing, many Trump voters (or potential Trump voters) bring up abortion in explaining their voting rationale.

On top of pressing fiscal deadlines, hurricane relief and tax overhaul, President Trump may ask lawmakers to take on a controversial immigration policy regarding so-called "DREAMers."

Guilty or innocent, the drug-corruption trial in New York of high-ranking former Mexican government official, Genaro Garcia Luna, shows the limits of the U.S. to win its decades-long "war on drugs."

More than 80% of voters say the cost of living in New York State is a major problem, with the migrant influx and affordable housing following behind as intriguing issues. That's according to a new Siena College Research Institute poll, which Siena's Steve Greenberg weighed in on with WAMC News.

The federal government has sued Amazon for allegedly using its monopoly power to stamp out rivals. Now, some small businesses that sell on the marketplace reveal what it's like to depend on Amazon.

A region that was the scene of major combat a year ago has been quiet for the past two months, Marines say — thanks in part to a group of local Afghans who act as a sort of an armed neighborhood watch. They identify Taliban fighters and have found caches of IEDs.