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Before he was a journalist, NPR science correspondent Joe Palca studied psychology, and focused on sleep research. He found it frustrating to study sleep: Though there are many questions about why and how we sleep, scientists have very few answers.

Why can some people sleep through a jackhammer at the window, while others waken with the lightest whisper? Host Rachel Martin speaks to Johns Hopkins Sleep Disorders Center researcher Jeffrey Ellenbogen about his new study on how noises interrupt sleep.

President Obama's speech capped a day of festivities in Washington, D.C. that began with a march across the National Mall. That's where thousands gathered against a backdrop of tight security and rainy weather. On the white marble steps of the Lincoln Memorial, national leaders took turns addressing the crowd.

The Earth's average annual temperature has been rising for decades, but not in the last 15 years — colder winters and hotter summers notwithstanding. Now scientists offer evidence that this "pause" in average warming is because a cooler Pacific is temporarily taking up more heat than usual.

Dumplings are a huge part of Chinese culinary tradition, and restaurants there cater to the nation's obsession with a dazzlingly array of dumpling shapes and fillings, including green frogs stuffed with bullfrog meat and a flock of birds filled with roasted Beijing duck.

Fast food and restaurant work used to be seen as an entry point for the young. Today, the average such employee is 29, and nearly a quarter are parents. For these workers, current wages are hardly enough to support them, let alone their families.

New York City public advocate Bill de Blasio has surged to a commanding lead among Democratic primary voters. De Blasio's timing couldn't be better. In less than two weeks, those voters will go the polls to begin choosing the successor to Michael Bloomberg.

NPR correspondent and former All Things Considered co-host Noah Adams recalls a day he spent with the famed crime writer in Detroit.

Dan Pashman of the Sporkful podcast is worried that you may not be thinking enough about the ice in your drink. Bad ice could leave your drink warm and watery. He tells host Rachel Martin how to fix the problem.

Surrounded by scenic pastoral landscape, a restaurant in Lancaster County, Pa., has a lot of tongues wagging over its signature beef dish, called "The Truth." Its fans like knowing exactly where their meat is coming from.