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.

Picking a mate can be one of life's most important decisions. But sometimes people make a choice that seems to make no sense at all. And humans aren't the only ones — scientists have now seen apparently irrational romantic decisions in frogs.

Little tungara frogs live in Central America, and they're found everywhere from forests to ditches to parking lot puddles. These frogs are only about 2 centimeters long, but they are loud. The males make calls to woo the females.

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For wildlife biologists, unmanned aerial vehicles are like a dream come true.

Instead of struggling through rugged, difficult terrain to get to the animal they want to study, they can just send in a drone with a camera.

And as drones get cheaper and more available, everyone in biology seems to have new ideas for how to use them, says Mark Ditmer, a wildlife ecologist at the University of Minnesota, St. Paul.

But how do the animals feel about these little UFOs hovering overhead?

Scientists have just sequenced the first genome of an octopus, and it was no trivial task.

"The octopus has a very large genome. It's nearly the size of the human genome," says Carrie Albertin, a biologist at the University of Chicago.

As technology to sequence DNA has gotten faster and cheaper, scientists have unraveled the genes of all kinds of creatures. But until now, no one had done an octopus — despite its obvious appeal as one of the weirdest animals on Earth.

Take a close look at a house cat's eyes and you'll see pupils that look like vertical slits. But a tiger has round pupils — like humans do. And the eyes of other animals, like goats and horses, have slits that are horizontal.

Scientists have now done the first comprehensive study of these three kinds of pupils. The shape of the animal's pupil, it turns out, is closely related to the animal's size and whether it's a predator or prey.

Bumblebees are important pollinators of crops and wildflowers across the U.S., and they gather heavy loads of nectar and pollen from flowers. A study published Monday shows that the type of food they carry affects how they fly.

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Scientists have found a "new" horned dinosaur that lived about 79 million years ago — and they say the discovery helps them understand the early evolution of the family that includes Triceratops.

The new dinosaur, which was named Wendiceratops pinhornensis after a famous fossil hunter who discovered the bone bed in Canada where these fossils were buried, is one of the oldest known horned dinosaurs.

Scientists say they've found a bit of DNA in woolly mammoths that could help explain how these huge beasts were so well-adapted to live in the cold of the last ice age.

Woolly mammoths had long shaggy fur, small tails and ears to minimize frostbite, and a lot of fat to help stay warm as they roamed the tundra more than 12,000 years ago.

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When giant icebergs break off of huge, fast-moving glaciers, they essentially push back on those rivers of ice and temporarily reverse the flow.

That's according to a new study of "glacial earthquakes," an unusual kind of temblor discovered just over a decade ago.

The fossilized remains of a bizarre-looking reptile are giving scientists new insights into how turtles got their distinctive shells.

Some 240 million years ago, this early turtle-like creature lived in a large lake, in a fairly warm, subtropical climate. But it didn't have the kind of shell modern turtles have, says Hans-Dieter Sues, a curator at the Smithsonian's National Museum of Natural History in Washington, D.C.

Moon jellies have an unusual self-repair strategy, scientists have learned. If one of these young jellies loses some limbs, it simply rearranges what's left until its body is once again symmetrical.

"We were not expecting to see that," says Michael Abrams, a graduate student in biology at the California Institute of Technology.

All creatures have tricks to heal themselves. If you get a cut, your skin will form a scar. And some sea creatures, like starfish and sea cucumbers, can regenerate lost body parts.

Saturn is famous for its lovely rings, but this gas giant has another ring that people normally don't see — and some new observations with an infrared telescope show that this mysterious ring is even bigger than scientists thought.

The first hint that Saturn had this secret ring came back in 1671, when the Italian astronomer Giovanni Domenico Cassini looked through a telescope and discovered the moon now known as Iapetus.

A cheap new lab test can use just a drop of blood to reveal the different kinds of viruses you've been exposed to over your lifetime.

The test suggests that, on average, people have been infected with about ten different types of known virus families, including influenzas, and rhinoviruses that cause the common cold, according to a report published Thursday in Science.

In Bonn, Germany, hundreds of people have gathered to work on a draft version of a major United Nations agreement to control greenhouse gas emissions that are changing the Earth's climate.

And when I found out that climate change negotiations basically all boil down to writing and editing a document, I was intrigued.

Since the 1960s, biologists have made fake eggs for some studies of bird behavior. But Mark Hauber of Hunter College in New York says this kind of scientific handicraft is not exactly his forte.

"I'm a terrible craftsperson," he admits.

That's why Hauber is pioneering the use of 3-D printing technology to quickly produce made-to-order fake eggs, taking a bit of old-school science into the 21st century.

Rip open a little package of baker's yeast from the supermarket, peer inside, and you'll see your distant cousin.

That's because we share a common ancestor with yeast, and a new study in the journal Science suggest that we also share hundreds of genes that haven't really changed in a billion years.

Edward Marcotte, a biologist at the University of Texas at Austin, knew that humans and yeast have thousands of similar genes. But, he wondered, how similar are they?

Here's a job that sounds perfect for either a superhero or a glutton for punishment: Get nearly 200 countries to finally agree to take serious action on climate change.

Two men have taken on this challenge. They're leading some international negotiations that will wrap up later this year in Paris at a major United Nations conference on climate change.

Scientists have discovered a group of microbes at the bottom of the Atlantic Ocean that could provide new clues to how life went from being simple to complex.

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