Nell Greenfieldboyce

Nell Greenfieldboyce is a NPR science correspondent.

With reporting focused on general science, NASA, and the intersection between technology and society, Greenfieldboyce has been on the science desk's technology beat since she joined NPR in 2005.

In that time Greenfieldboyce has reported on topics including the narwhals in Greenland, the ending of the space shuttle program, and the reasons why independent truckers don't want electronic tracking in their cabs.

Much of Greenfieldboyce's reporting reflects an interest in discovering how applied science and technology connects with people and culture. She has worked on stories spanning issues such as pet cloning, gene therapy, ballistics, and federal regulation of new technology.

Prior to NPR, Greenfieldboyce spent a decade working in print, mostly magazines including U.S. News & World Report and New Scientist.

A graduate of Johns Hopkins, earning her Bachelor's of Arts degree in social sciences and a Master's of Arts degree in science writing, Greenfieldboyce taught science writing for four years at the university. She was honored for her talents with the Evert Clark/Seth Payne Award for Young Science Journalists.

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RAY SUAREZ, HOST:

It's Earth Day, and across the country and around the world, there are demonstrations taking place in the name of science. Organizers say there were events in more than 600 cities and towns around the world.

President Trump issued a sweeping executive order on Tuesday that will begin to undo a slew of government efforts to fight global warming.

Among those worrying and watching to see how the executive order plays out are scientists who actually are in favor of exploring bold interventions to artificially cool the climate.

Updated at 4:02 p.m. ET

If there was any doubt over President Trump's views on climate change, those doubts evaporated with the unveiling of his proposed federal budget on Thursday.

The budget would end programs to lower domestic greenhouse gas emissions, slash diplomatic efforts to slow climate change and cut scientific missions to study the climate.

Scientists around the United States are getting ready to do an unprecedented experiment: They plan to march en masse in Washington, D.C., and other cities on April 22, to take a stand for the importance of public policies based on science.

Some researchers predict that this March for Science will release much needed energy and enthusiasm at a time when science is under threat; others worry it will damage science's reputation as an unbiased seeker of truth.

A small, faint star relatively close by is home to seven Earth-size planets with conditions that could be right for liquid water and maybe even life.

The discovery sets a record for both the most Earth-size planets and the most potentially habitable planets ever discovered around a single star.

Plants that feed on flesh have fascinated scientists going all the way back to Charles Darwin, and researchers now have new insight into how these meat-eaters evolved.

Even plants that evolved continents away from one another rely on strikingly similar tricks to digest their prey.

Last year, global warming reached record high temperatures — and if that news feels like déjà vu, you're not going crazy.

The planet has now had three consecutive years of record-breaking heat.

The holiday season is a time when lots of people take to the air, flying to see relatives or go on vacation. But when it comes to seasonal travel, humans are totally outnumbered by insects.

That's according to a newly published study in the journal Science, which found that more than 3 trillion migrating insects fly over south-central England each year.

Copyright 2016 NPR. To see more, visit http://www.npr.org/.

ARI SHAPIRO, HOST:

President-elect Donald Trump intends to nominate Oklahoma Attorney General Scott Pruitt to head the Environmental Protection Agency, announcing his decision in a statement Thursday.

As attorney general, Pruitt has made no secret of his disdain for the EPA.

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ARI SHAPIRO, HOST:

The good news for those worried that the U.S. will lose its leadership role in confronting climate change: President-elect Donald Trump said Tuesday, "I have an open mind to it. ... I do have an open mind."

At a meeting Tuesday with New York Times journalists and executives, Trump said he thinks "there is some connectivity" in terms of human activity causing climate change.

When scientists recently announced that they had discovered a new planet orbiting our closest stellar neighbor, Proxima Centuri, they also released an artist's conception of the planet.

A mysterious glowing "blob" in outer space has puzzled astronomers for more than 15 years. Now, a team of researchers says it has uncovered the secret behind the blob's eerie light.

The blob was first spotted back in the late 1990s by Chuck Steidel, an astronomer at Caltech, and some colleagues. They were observing a bunch of galaxies in the distant reaches of the universe, he recalls, "but we also saw these big blotchy things."

When you praise a dog, it's listening not just to the words you say but also how you say them.

That might not be huge news to dog owners. But now scientists have explored this phenomenon by using an imaging machine to peek inside the brains of 13 dogs as they listened to their trainer's voice.

Copyright 2016 NPR. To see more, visit NPR.

An African bird called the Greater honeyguide is famous for leading people to honey, and a new study shows that the birds listen for certain human calls to figure out who wants to play follow-the-leader.

The finding underscores the unique relationship that exists between humans and this wild bird.

The luminous glow of light pollution prevents nearly 80 percent of people in North America from seeing the Milky Way in the night sky.

That's according to a new atlas of artificial night sky brightness that found our home galaxy is now hidden from more than one-third of humanity.

NASA announced Tuesday the discovery of an unprecedented number of planets beyond our solar system — astronomers have confirmed the existence of 1,284 new worlds orbiting distant stars.

These planets beyond our solar system — exoplanets — were discovered with the help of NASA's Kepler Space Telescope, which launched in 2009.

A trio of newly discovered Earth-sized planets looks ideally suited to search for signs that these alien worlds might be able to support life.

The planets orbit close to an unusually small, reddish star that's about one-eighth the size of our sun and is far cooler, researchers report in the journal Nature.

The largest research hospital in the world, the National Institutes of Health Clinical Center in Bethesda, Md., needs reform so that patient safety is always the priority — and never subservient to the demands of science.

Finding a new planet that orbits a distant star isn't such a big deal anymore — astronomers have discovered around 2,000. But no one knows if any of these planets has a moon.

That might change this year, if a moon-hunting project goes as planned.

Anyone can follow the pregnancy of a monkey infected with Zika virus in real time, thanks to an experiment in data sharing that's unusual for biology.

When Carolyn Coyne's lab at the University of Pittsburgh recently tried to order a sample of Zika virus from a major laboratory supplier, they were told it was out of stock.

"They are actually back-ordered until July for the virus," Coyne says. "At least that's what we were told." She ended up obtaining Zika from another source, and it arrived at her lab Tuesday.

The astronomer whose work helped kick Pluto out of the pantheon of planets says he has good reason to believe there's an undiscovered planet bigger than Earth lurking in the distant reaches of our solar system.

As diplomats argue in Paris over a new global agreement to fight climate change, their work is driven by scientists' dire predictions of how unchecked warming will transform our planet decades and centuries from now.

But how can researchers be so sure of what will happen that far off?

Leaders from around the world are converging on Paris for the 2015 U.N. Climate Change Conference. The two-week event is designed to allow countries the chance to come to an agreement on stifling climate change.

Below are 10 questions and answers that should better prepare you for the conference and what to expect during and after its completion.

Click the audio link at the top of this page to listen to "Heating Up," NPR's special on climate change, hosted by Ari Shapiro. Share it, download it, take it with you.

Cod was once so plentiful in New England that legend had it you could walk across the local waters by stepping on the backs of the fish.

Now, though, this tasty species is in such trouble there that cod fishing is practically shut down.

And scientists say it looks like rapid warming in the Gulf of Maine explains why regulators' recent efforts to help the cod while allowing fishing were a failure.

Scientists have just made a breakthrough in understanding how clouds interact with the surrounding air by studying some of the most boring clouds you can imagine in unprecedented detail.

"If you ask a child to draw a cloud they would draw a white puffy cloud floating in the air all by itself — and that's the kind of cloud we were looking at," says Raymond Shaw, an atmospheric scientist at Michigan Technological University.

Everyone knows that caffeine can keep you awake, but a new study shows that the world's most popular drug can actually interfere with your body's internal sense of time.

"The circadian clock is way beyond 'sleep and wake,' " says Kenneth Wright, a sleep and circadian physiologist at the University of Colorado, Boulder. "The circadian clock is present in cells throughout our entire body. It's in your fat cells; it's in your muscle cells. It's in your liver, for example, as well as in your brain."

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