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.

A controversy erupted earlier this year over who deserved credit for what many say is the most important astronomical discovery of the 20th century: the realization that the universe was expanding.

In 1929, American astronomer Edwin Hubble proposed that the more distant a galaxy is, the faster it appears to be receding from us, a concept that is known as Hubble's law.

Astronomer Mario Livio has worked with the Hubble Space Telescope for more than 20 years. "So clearly, anything Hubble is of interest to me," he says.

It doesn't happen often, but there are times when a single book turns the world on its head. Isaac Newton's Principia unraveled the mystery of gravity. Charles Darwin's On the Origin of Species explained how evolution worked.

But before either of these, there was On the Revolutions of the Heavenly Spheres by Nicolaus Copernicus. It was published in 1543. In it, Copernicus made the astounding claim that Earth revolves around the sun, not the other way around.

It's a huckster's dream: "Try the new Burmese Python Diet. No calorie counting or special foods. Eat whatever comes along, up to a quarter of your body weight. Not only is it good for your waistline; it's good for your heart."

Trouble is, what works in pythons probably won't work for humans.

Pythons employ what scientists call a "sit and wait foraging tactic." In other words, they lie around in a Burmese jungle and wait for the food to come to them. And of course, this can mean months between meals.

Richard Larrick has been bothered by something for two decades.

"Twenty years ago, I'd done a paper with some graduate students just showing that in hotter temperatures, pitchers are more likely to hit batters with pitches," says Larrick, a professor at the Fuqua School of Business at Duke University.

Was it because they would sweat more, and the ball might get slippery and hard to control? Or was it something intentional?

Researchers in New York are reporting an advance in creating cloned human embryos. The embryos would not be used for reproduction, but rather the creation of embryonic stem cells. Many scientists believe that human embryonic stem cells made this way could revolutionize medicine.

The advantage of stem cells made this way is that they could be personalized to an individual.

Astronomers are lining up to use a powerful new NASA telescope called SOFIA. The telescope has unique capabilities for studying things like how stars form and what's in the atmospheres of planets.

But unlike most of the space agency's telescopes, SOFIA isn't in space — it flies around mounted in a Boeing 747 jet with a large door cut on the side so the telescope can see out. Putting a telescope in space makes sense: There's no pesky atmosphere to make stars twinkle. But why put one on a plane?

Weird things jump out at me in press releases.

Take the press kit NASA prepared for the GRAIL mission. GRAIL consists of two nearly identical spacecraft that are on their way to the moon. Once there, they will make a precise map of the moon's gravitational field. Such a map will help scientists refine their theories about how the moon formed and what the interior is made of.