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Atmospheric scientist Ira Leifer installed special air sensors on a camper, then drove from Florida to California, measuring methane levels all along the way. More than 6,000 readings later, he found some noticeable spikes, especially around petrochemical plants and urban areas like Los Angeles.

The U.S. was a reluctant entrant into World War I. But when America joined the battle 100 years ago, on April 6, 1917, it transformed a small military in a major international force almost overnight.

In a case before the Supreme Court Monday, an Arizona town maintains that Good News Community Church's signs are temporary directional signs for events, and thus limited to 6 square feet.

A spike in pandemic pets is increasing shortages and burnout among veterinarians — a field that already had high rates of suicide. A new mental health initiative offers professional help for free.

Every trial has its own peculiar rhythms. The first seditious conspiracy case to stem from the Capitol riot is no exception.

Nichols, 29, was pulled over on Jan. 7 for what police said was reckless driving. After trying to flee on foot, Nichols was severely beaten by police. He died in a hospital days later.

Camps in Syria have become overcrowded in the northwest of the country after the February 6 earthquake. NPR talks to Dr. Mego Terzian of Doctors without Borders about his assessment of the situation.

The blockbuster $1.6 billion defamation lawsuit is set to go to trial next month in a Delaware court.

When Maryland Gov. Martin O'Malley challenged the state's 5.6 million residents to reduce their home electricity consumption by 15 percent, NPR's Richard Harris looked at ways his household could better conserve.

Hurricane Beryl weakened slightly to a category 3 early Monday, the National Hurricane Center said. On Sunday, Beryl was the first-ever Atlantic hurricane to reach a Category 4 level in June.