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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12:58pm

Thu October 11, 2012
The Salt

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

Originally published on Thu October 11, 2012 2:36 pm

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

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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3:17am

Wed October 10, 2012
Shots - Health Blog

Fun With Physics: How To Make Tiny Medicine Nanoballs

Originally published on Thu October 11, 2012 9:20 am

Álvaro Marín

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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2:22pm

Tue September 25, 2012
Shots - Health Blog

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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3:07pm

Thu September 20, 2012
Shots - Health Blog

Could Genes For Stripes Help Kitty Fight Disease?

Originally published on Thu September 20, 2012 6:04 pm

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

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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6:33pm

Mon September 10, 2012
Shots - Health Blog

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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3:52am

Thu September 6, 2012
Animals

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

Originally published on Fri September 7, 2012 5:28 am

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

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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1:09pm

Wed September 5, 2012
Joe's Big Idea

Cellphone Medical Test Wins NPR's 'Big Idea' Contest

Originally published on Wed September 5, 2012 5:36 pm

Catherine Wong used electrical components to build an electrocardiogram that sends data by cellphone.
Courtesy of Catherine Wong

Most of us would like to make life better for people in developing countries. Most of us don't do anything about it. Catherine Wong is different. She's the winner of our Joe's Big Idea video contest. She not only came up with a big idea to improve health care for the poor but also built a prototype to test it.

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2:51pm

Thu August 30, 2012
Humans

Pinky DNA Points To Clues About Ancient Humans

Originally published on Thu August 30, 2012 6:09 pm

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

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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3:23am

Thu August 23, 2012
Joe's Big Idea

Telescope Innovator Shines His Genius On New Fields

Originally published on Thu August 23, 2012 12:23 pm

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

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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3:31am

Mon August 13, 2012
Joe's Big Idea

Summer Science: What's A Meteor Shower?

Originally published on Mon August 13, 2012 4:23 am

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

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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