A group of scientists from Boulder, Colo., compared three different atomic clocks. It's a step toward redefining the length of a second.

From fish in jars to rare seeds and microbes, hundreds of millions of biological specimens are stored around the U.S., and caretakers are trying to make them accessible for future research.

Mount Merapi on the Indonesian island of Java has been erupting regularly and is considered a highly active volcano. No injuries were reported after Saturday's eruptions, but officials advise caution.

Balaram Khamari has been spending a lot of time in his lab in Puttaparthi, India, culturing colorful bacteria and artfully arranging it on a jelly like substance called agar.

Amid the pandemic, a new audio program is trying to reach residents who speak the Guatemalan language Mam. The show's founder Henry Sales hopes to help combat the COVID-19 crisis in his community.

The asteroid Apophis was taken off of NASA's "risk list" after the space agency determined earlier this month that it poses no risk of impact to Earth within the next century.

NPR's Scott Simon speaks to Jason Forshaw, an aerospace engineer at Astroscale, about ELSA-d, a machine used to clean up junk in space.

The Tuskegee syphilis study is often cited as a reason why Black Americans might hesitate on the COVID-19 vaccine. But many say it's current racism in health care and Tuskegee is used as an excuse.

Diets often fail in the long term because they're too strict or require unnatural eating habits. In a new book, Barry Estabrook turns to science and history to find a weight-loss regimen that works.

Octopuses have an "active" phase of sleep, the kind that might involve dreaming, but they probably don't have long, complicated dreams like people do.

The Bank of England unveiled the new £50 note on Thursday, nearly two years after saying it would honor the pioneering mathematician who died an outcast because of his homosexuality.

The number of bald eagles in the lower 48 states has quadrupled since 2009, according to a new survey. The findings are a bright spot in an otherwise troubling picture for American birds.

Getting the COVID-19 vaccine into most Americans' arms will involve much more than a good supply and logistics. Values such as equity, deep listening, and informed choice are crucial, too.

Women in Alaska's remote areas usually travel long distances to give birth, but the pandemic has made that difficult. Expectant mothers are spending the end of pregnancy alone in hospital-run housing.

Two dozen states had hoped to sue the owners of Purdue Pharma for their alleged role in the opioid crisis. But a federal bankruptcy has judge put the brakes on — again — until April 21.