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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.

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.

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."

Indonesia's founding philosophy includes the notions of unity and social justice for all. But there are growing concerns that the country is becoming less tolerant than it once was.

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.

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."

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.

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.

NPR's Michel Martin asks Rep. Jim Himes of Connecticut, top Democrat on the House Intelligence committee, about the Iranian attack on a U.S. airbase in Qatar.