Nell Greenfieldboyce

A 30-year, nationwide study of ecological changes — including the effects of climate warming — has been releasing a powerful greenhouse gas, and critics want it to stop.

In the week since the first images from the James Webb Space Telescope were unveiled, astronomers have been poring through all the observations it's made so far--and they're happily overwhelmed.

In the week since the first James Webb Space Telescope images were unveiled, astronomers have been poring over all its observations so far. What they've seen has them giddy.

The largest bacteria known to science have been discovered in the Caribbean. They're visible to the naked eye and surprisingly complex.

An isolated population of polar bears in southeast Greenland has learned to hunt on freshwater glacier ice. That means they may be able to survive longer as climate change makes sea ice scarce.

The amount of resources devoted to studying gun violence is paltry compared to its public health impact. Still the evidence shows certain policies might help prevent mass shootings.

An image of what looks like a glowing orange donut is actually the first picture of the supermassive black hole at the center of the Milky Way, our home galaxy.

The first ever image of the black hole at the center of our galaxy has been released by scientists, who say it shows Albert Einstein was right about gravity.

The CDC reports a historic increase in firearm deaths. During the pandemic, there has been a 35% increase in the firearm homicide rate, and suicides by firearm also are persistently high.

The rate of U.S. gun homicides jumped nearly 35% in 2020 to the highest level in more than 25 years. And gaps widened for groups already at the highest risk, especially Black men and boys.

NASA and the European Space Agency are gearing up to bring home a pristine sample of Martian rock. But given the small chance of life on the red planet, they have to grapple with safety questions.

Millions of chickens and turkeys have been killed to control an avian flu outbreak, but the virus is also infecting wild birds. (Story first aired on Weekend Saturday on April 9, 2022.)

NASA should send probes to the ice giant planet of Uranus and to a moon of Saturn where conditions could be right for life. Those are some of the recommendations in a new report to the space agency.

A study suggests babies are aware that people who are willing to share saliva, through kissing or sharing spoons, have especially close relationships. (Story aired on ATC on Jan. 20, 2022.)

A new look at some fossilized footprints shows that more than one species of human was walking upright around 3.6 million years ago. (This story originally aired on ATC on Dec. 2, 2021.)

Scientists are tracking a deadly bird flu outbreak that has infected wild birds in more than 30 states. Purging the nation's poultry supply may not be enough to keep the virus from sticking around.

Scientists using the Hubble Space Telescope have spotted light from what appears to be the most distant star ever seen. It offers a glimpse into an early moment in the history of the universe.

How do boa constrictors breathe while constricting their victims? A new study finds that snakes can switch which set of ribs they use to draw in air as they crush their meal before devouring it.

Building and operating telescopes can generate a lot of greenhouse gases. In fact, it's as if each astronomer in the world was driving more than 100,000 miles per year, a new study finds.

Picture perfect: Mission managers say the telescope's mirror segments have been aligned and have focused on single stars, a critical milestone, and the telescope is working flawlessly.