Joe Palca

Joe Palca is a science correspondent for NPR. Since joining NPR in 1992, Palca has covered a range of science topics — everything from biomedical research to astronomy. He is currently focused on the eponymous series, "Joe's Big Idea." Stories in the series explore the minds and motivations of scientists and inventors.

Palca began his journalism career in television in 1982, working as a health producer for the CBS affiliate in Washington, DC. In 1986, he left television for a seven-year stint as a print journalist, first as the Washington news editor for Nature, and then as a senior correspondent forScience Magazine.

In October 2009, Palca took a six-month leave from NPR to become science writer in residence at the Huntington Library and The Huntington Library, Art Collections, and Botanical Gardens.

Palca has won numerous awards, including the National Academies Communications Award, the Science-in-Society Award of the National Association of Science Writers, the American Chemical Society James T. Grady-James H. Stack Award for Interpreting Chemistry for the Public, the American Association for the Advancement of Science Journalism Prize, and the Victor Cohn Prize for Excellence in Medical Writing.

With Flora Lichtman, Palca is the co-author of Annoying: The Science of What Bugs Us (Wiley, 2011).

He comes to journalism from a science background, having received a Ph.D. in psychology from the University of California at Santa Cruz where he worked on human sleep physiology.

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The Salt
12:59 pm
Tue December 18, 2012

Building A Rover Of The Edible Kind

The other Mars Curiosity rover, made of gingerbread and on display on the Caltech campus.
Brian Bell courtesy California Institute of Technology

Originally published on Thu December 20, 2012 9:47 am

The folks at the California Institute of Technology have built another Mars rover, but this one will never get to leave Earth. Not surprising, really, since it's made of gingerbread.

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Space
9:06 am
Tue December 4, 2012

NASA Scientists 'Very Careful' With New Mars Data

This photo, taken by NASA's Curiosity rover, shows Mars' Gale Crater, where the rover has taken samples for chemical analysis. Scientists believe that at some point in the very distant past, there was a riverbed here.
AP

Originally published on Mon December 3, 2012 3:22 pm

NASA is finally receiving data on Martian soil samples from Curiosity, its rover currently traversing the red planet. The results from the soil samples hint at something exciting, but rover scientists are making very sure not to raise expectations.

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Space
12:30 pm
Sun December 2, 2012

Signs Of Life On Mars? Not Exactly

NASA's Mars rover Curiosity cut a wheel scuff mark into a wind-formed ripple at the "Rocknest" site to give researchers a better opportunity to examine the particle-size distribution of the material forming the ripple.
NASA/JPL-Caltech

Originally published on Sun December 2, 2012 2:06 pm

The director of NASA's Jet Propulsion Laboratory said last week that preliminary data showed the possibility that the agency's Mars Science Laboratory – the six-wheeled rover that landed on Mars in August — had found signs of carbon-containing molecules.

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Space
11:05 am
Thu November 29, 2012

Space Probe Finds Ice In Mercury's Craters

Researchers say they have identified traces of ice in craters on Mercury, seen here in this Oct. 8, 2008, image from the Messenger spacecraft.
NASA

Originally published on Thu November 29, 2012 2:37 pm

Mercury is not the first planet to come to mind if you were searching for ice in the solar system. After all, the surface temperature across most of the planet is hot enough to melt lead.

But at the poles on Mercury it's a different story. Almost no sun reaches the poles, and as a result, temperatures can drop to less than -100 degrees Fahrenheit. Now, three papers in the journal Science suggest there really is ice at the bottom of craters near the poles on Mercury.

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Space
12:28 am
Tue November 20, 2012

Big News From Mars? Rover Scientists Mum For Now

NASA's Mars rover Curiosity dug up five scoops of sand from a patch nicknamed "Rocknest." A suite of instruments called SAM analyzed Martian soil samples, but the findings have not yet been released.
NASA/JPL-Caltech

Originally published on Fri March 21, 2014 1:11 pm

Scientists working on NASA's six-wheeled rover on Mars have a problem. But it's a good problem.

They have some exciting new results from one of the rover's instruments. On the one hand, they'd like to tell everybody what they found, but on the other, they have to wait because they want to make sure their results are not just some fluke or error in their instrument.

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Superstorm Sandy: Before, During And Beyond
2:06 am
Sun November 4, 2012

Levee Rebuilding Questioned After Sandy Breach

A man crosses a flooded street in the wake of Superstorm Sandy on Thursday in Little Ferry, N.J. Surprise coastal surge floods caused by the storm battered Little Ferry, Moonachie and some other towns along the Hackensack River in Bergen County, all areas unaccustomed to flooding.
Mike Groll AP

Originally published on Mon November 5, 2012 12:19 pm

Every time a storm brings flooding to a large metropolitan area, there are calls to improve the levee systems that are designed to prevent flooding.

But there's a major problem with doing that. "We don't know where all of our levees are," says Samantha Medlock with the Association of State Floodplain Managers.

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Around the Nation
1:39 pm
Thu November 1, 2012

In Flooded New Jersey, No Oversight For Levees

An emergency responder helps residents of Little Ferry, N.J., after their neighborhood was flooded due to Superstorm Sandy.
Andrew Burton Getty Images

Originally published on Thu November 1, 2012 3:42 pm

Residents of Moonachie and Little Ferry, N.J., are beginning to clear the damage after their communities were inundated by floodwaters. The flooding occurred when a system of levees and berms was unable to control the storm surge pushed ashore by Superstorm Sandy.

Geologist Jeffrey Mount of the University of California, Davis, isn't surprised. "There really are only two kinds of levees," he says, "those that have failed, and those that will fail."

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Shots - Health Blog
12:29 am
Mon October 15, 2012

Spray Lights Up The Chemical That Causes Poison Ivy Rash

Urushiol, the chemical in poison ivy, is also harvested from the Japanese lacquer tree to coat lacquerware. Here, a rash caused by lacquerware that likely was not properly cured.
Kenji Kabashima

Originally published on Thu October 18, 2012 11:17 am

You'd think that someone who is a science correspondent and is as allergic to poison ivy as I am would have heard of urushiol, but no. I didn't recognize the word when I saw it a week or so ago. Now, thanks to my new beat (Joe's Big Idea), I'm allowed to dig a little deeper into stories, and what I learned about urushiol is pretty amazing.

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The Salt
9:58 am
Thu October 11, 2012

100 Years Ago, Maillard Taught Us Why Our Food Tastes Better Cooked

A tower of profiteroles like this one, known as croquembouche, was created in France to celebrate Maillard, the man credited with identifying a key reaction in food science.
Gavin Tapp via Flickr

Originally published on Thu October 11, 2012 11:36 am

A few hundred scientists gathered in the small French city of Nancy recently to present scientific papers related to a chemical reaction. Now that may seem a bit humdrum and hardly worth mentioning in The Salt, but in this case, it isn't.

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Shots - Health Blog
12:17 am
Wed October 10, 2012

Fun With Physics: How To Make Tiny Medicine Nanoballs

Álvaro Marín

Originally published on Thu October 11, 2012 6:20 am

For the past decade, scientists have been toying with the notion of encapsulating medicine in microscopic balls.

These so-called nanospheres could travel inside the body to hard-to-reach places, like the brain or the inside of a tumor. One problem researchers face is how to build these nanospheres, because you'd have to make them out of even smaller nanoparticles.

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Shots - Health Blog
11:22 am
Tue September 25, 2012

Korean Eunuchs Lived Long And Prospered

A mural in an ancient tomb in China shows a troupe of eunuchs. How long did they live?
Wikimedia Commons

Tell people you're doing a story about the life spans of Korean eunuchs, the typical reaction is a giggle or a cringe.

But if you can overcome your visceral response to the topic, a study scientists in Korea did is quite interesting, both for what they found, and the way they found it.

Several scientists have shown that there is a link between longevity and reproduction: the greater the fertility, the shorter the life span. This has been fairly well established in nonhuman animal species, but proving it's the case for humans has been tricky.

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Shots - Health Blog
12:25 pm
Thu September 20, 2012

Could Genes For Stripes Help Kitty Fight Disease?

The genetic factors responsible for a cat's stripes might help researchers understand disease resistance in humans.
kennymatic via Flickr

Originally published on Thu September 20, 2012 3:04 pm

At this point it's just an interesting hypothesis, but it's possible that understanding cat coloration could help scientists understand resistance to infectious diseases.

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Shots - Health Blog
3:33 pm
Mon September 10, 2012

Vaccine For Dengue Fever Shows A Glimmer Of Hope

A health worker in the Domincan Republic sprays insecticide between houses to stop dengue fever outbreaks this month.
Erika Santelices AFP/Getty Images

It's human nature to hope for positive results after spending months or even years conducting a research study. In well-designed studies, however, scientists identify in advance the criteria for success, so their optimism won't color their conclusions when the study is completed.

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Animals
12:52 am
Thu September 6, 2012

Who's Your Daddy?: Male Snail Carries Eggs As Cargo

A male Solenosteira macrospira, left, carries snail eggs on its shell. But not all of the eggs were fertilized by him. Females, like the one on the right, deposit the eggs into papery capsules and attach them to the males' shells.
P.B. Marko Ecology Letters

Originally published on Fri September 7, 2012 2:28 am

A man is not a mollusk, and many men probably think that's a good thing. And it's not just because a mollusk is a squishy invertebrate with a shell. It's also because for at least one species of mollusk, the males do all the heavy lifting when it comes to childcare.

The species of mollusk we're talking about is Solenosteira macrospira, a marine snail about 2 inches long. These snails live off the coast of Baja California, and during the mating season, the beach is awash with male and female snails in connubial bliss.

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Humans
11:51 am
Thu August 30, 2012

Pinky DNA Points To Clues About Ancient Humans

A replica of the pinky bone fragment found in a Siberian cave. Researchers used the bone bit to extract and sequence the genome of a girl who lived tens of thousands of years ago.
Max Planck Institute for Evolutionary Anthropology

Originally published on Thu August 30, 2012 3:09 pm

Scientists in Germany have been able to get enough DNA from a fossilized pinky to produce a high-quality DNA sequence of the pinky's owner.

"It's a really amazing-quality genome," says David Reich of Harvard Medical School in Boston. "It's as good as modern human genome sequences, from a lot of ways of measuring it."

The pinky belonged to a girl who lived tens of thousands of years ago. Scientists aren't sure about the exact age. She is a member of an extinct group of humans called Denisovans. The name comes from Denisova cave in Siberia, where the pinky was found.

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Joe's Big Idea
12:23 am
Thu August 23, 2012

Telescope Innovator Shines His Genius On New Fields

Roger Angel, an astronomer at the University of Arizona, stands in front of his new project: a solar tracker. Angel wants to use the device to harness Arizona's abundant sunlight and turn it into usable energy.
Jason Millstein for NPR

Originally published on Thu August 23, 2012 9:23 am

You may not be familiar with the name Roger Angel, but if there were ever a scientist with a creative streak a mile wide, it would be he.

Angel is an astronomer. He's famous for developing an entirely new way of making really large, incredibly precise telescope mirrors. But his creativity doesn't stop there. He's now turned his attention to solar power, hoping to use the tricks he learned from capturing distant light from stars to do a more cost-efficient job of capturing light from the Sun.

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Joe's Big Idea
12:31 am
Mon August 13, 2012

Summer Science: What's A Meteor Shower?

In this photo released by SkyandTelescope.com, a Perseid meteor flashes across the constellation Andromeda on Aug. 12, 1997.
Rick Scott and Joe Orman AP

Originally published on Mon August 13, 2012 1:23 am

NPR science correspondent Joe Palca is on a mission this summer to answer the deep, burning questions of summertime. So far he's taught us how to build a campfire, explained the best way to roast a perfect marshmallow and explored the icy mystery of brain freeze.

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Joe's Big Idea
12:00 am
Fri August 10, 2012

So You Landed On Mars. Now What?

Adam Steltzner, the leader of the rover's entry, descent and landing engineering team, cheers after Curiosity touched down safely on Mars on Sunday.
Bill Ingalls/NASA Getty Images

Originally published on Fri August 10, 2012 3:28 am

The Mars rover Curiosity is beginning its fifth day on the red planet, and it's been performing flawlessly from the moment it landed.

That's been especially gratifying for NASA landing engineer Adam Steltzner. Last Friday, while Steltzner was still on pins and needles waiting for the landing to take place, I told the story of Steltzner's decision as a young man to give up his life as a rocker and go for a career in space engineering.

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The Two-Way
3:58 pm
Mon August 6, 2012

After A Historic Landing, A Postcard From The Jet Propulsion Laboratory

NASA Associate Administrator John Grunsfeld waits for landing inside the Spaceflight Operations Facility for NASA's Mars Science Laboratory Curiosity rover at Jet Propulsion Laboratory in Pasadena, Calif. on Sunday.
Brian van der Brug AP

Originally published on Tue August 7, 2012 5:42 am

The newsroom at NASA's Jet Propulsion Laboratory is beginning to thin out as the Mars Science Laboratory transitions from an exciting news story, to a long duration — possibly very long duration — exploration of the geologic and environmental history of Mars.

For the reporters still in the newsroom, fatigue is beginning to set in. BBC science correspondent Jonathan Amos has been at it nonstop for 30 hours. I feel a bit guilty for stepping out and getting a few hours sleep.

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Space
2:22 pm
Mon August 6, 2012

Curiosity Is On Mars, Now What?

Originally published on Mon August 6, 2012 3:44 pm

Joe Palca describes the mood of NASA Mars scientists in the wake of the landing overnight, what the latest pictures and data are from the surface of the red planet and what mission scientists are going to do next with Curiosity.

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