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Scientists say lake herring, a key fish in Lake Superior's food web, is suffering because of mild winters and Europe's appetite for roe. Some say the species may be at risk of "collapse."

The stethoscope seems so simple — a 19th century tool for listening more closely to the human heart or lungs. It also sparked a culture of listening that is transforming the way scientists learn.

Scientists who study bird behavior have made fake eggs to put in nests to see how birds react. This handicraft is going high-tech. (This piece first aired on May 26, 2015, on All Things Considered.)

GOP presidential hopeful Mike Huckabee was criticized for evoking the Holocaust in comments on Iran's nuclear deal. It's the latest chapter in relations between Jewish and evangelical communities.

Legally, a single fish species can go by many names from sea to plate, and different fish can go by the same name. An environmental group says that hampers efforts to combat illegal fishing and fraud.

The network said it was "outraged" that the court had been adjourned. The three journalists had been jailed for allegedly aiding the Muslim Brotherhood.

The AP commissioned tests over a five-month period. Experts who reviewed the results found that not a single venue is fit for swimming or even boating.

It is hoped that the new supercomputer, expected to go online by 2025, would be the first "exascale" machine — some 20 times faster than today's fastest machine, called Tianhe-2 (Milky Way-2).

Megan Brabec, 24, works three part time jobs with no benefits. "It does really frustrate me when I hear candidates talk about, 'Oh, well, you should have majored in something else," she said.

Forty years ago today, Hoffa pulled into a restaurant parking lot and was never heard from again. His story is one of union devotion, fraud and fierce political battles.