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Christopher Swain is nearing the end of a long, wet journey. He's about to finish swimming the entire 1,243-mile length of the Columbia River. NPR's Tom Goldman reports on why the trip was so important to the Portland, Ore., man. See photos of Swain and his online diary.

A massive waterspout off the coast of Destin, Fla., Tuesday captured the attention of many. Several conditions are necessary to create one of these tornado-like phenomena.

Hear the CSO and its charismatic conductor Riccardo Muti in a program showing the muscle and subtlety of the of orchestra in music by Scriabin, Debussy and Mendelssohn.

The dark patches, known as coronal holes, are regions where solar wind escapes more quickly and readily into space. Geomagnetic storms can disrupt GPS and hurt the power grid.

The magnitude 7.8 earthquake that struck Turkey and war-torn Syria on Monday has killed more than 20,000 people. Here are some of the world's deadliest earthquakes in the past quarter-century.

In 2022, the Greenland ice sheet continued to melt with two extreme melt-offs. Seabirds are dying off at an alarming rate. More ships are passing through the Arctic as the climate warms.

A documentary crew with the History Channel initially made the discovery during a dive looking for World War II-era wreckage.

Polar bears in Western Hudson Bay — on the southern edge of the Arctic — are continuing to die in high numbers, a government survey has found. Females and bear cubs are having an especially hard time.

Two adults and two children inside the vehicle survived the fall of 250-300 feet and the driver was arrested on charges of attempted murder and child abuse, the California Highway Patrol said.

NPR's Scott Simon wonders why teaching children about the Holocaust is not mandatory in most states and the lessons they are missing.