Science

Photographer Colin Legg makes time-lapse movies of celestial scenes, from auroras to eclipses. Photographing mostly in remote parts of Australia, where human-made light doesn't compete with starlight, Legg describes some of the challenges of this type of photography: from babysitting cameras for days and nights on end to running electronics in the backcountry.

Reporting in Science Translational Medicine, researchers write that neural stem cell implants were able to slow the onset of amyotrophic lateral sclerosis (ALS), or Lou Gehrig's disease, in mice. Study author Evan Snyder discusses the stem cells' protective effect, and why human trials may not be far behind.

The ancient Maya had many scientific accomplishments: they tracked the Moon and the planets, knew a solar year was 365 days, and even invented the concept of zero. As for the 2012 apocalypse? It's simply a misinterpretation of the Maya calendar, say archaeologists Marcello Canuto and William Saturno.

In a paper to be published in Astronomy & Astrophysics, researchers identified five possible planets around the star Tau Ceti. One of these alien worlds is within the star's habitable zone. Study co-author Steven Vogt discusses whether life could exist on the planet.

The SciFri Book Club is touring the solar system, with Dava Sobel's 2005 The Planets. Call in with a review of the book. Plus Jim Green, director of planetary science at NASA, joins the club to give an update on what's happened planet-wise since the book was published.

If you're a student at the halfway point of the academic year, and you've just taken stock of your performance, perhaps you have reason to feel proud of yourself.

But a recent study suggests some of the pride you feel at having done well — especially in science — may be unfounded. Or at least your sense of your performance may not be a very accurate picture of how good you actually are.

Nobody really wants to think about economics, the famously dismal science, while sitting down at a table loaded with love and calories. Like it or not, though, supply and demand drive food production and set the price of dinner.

So, in a season of feasts, what are the business stories on your holiday menu?

The controversial drilling technique known as hydraulic fracturing has created an oil and gas boom around the country. In states like Texas, Pennsylvania and Colorado, there's been heated debate about rules that protect groundwater and public health.

California is now wading into that arena with the release of the state's first fracking regulations. The state's earthquake-prone geology, however, could bring particular concerns.

Fracking itself isn't new. The technology behind it, though, has changed.

On the crisp, clear morning of April 22, a 50-ton asteroid slammed into the Earth's atmosphere and shattered into countless pieces. Remarkably, they rained down onto Sutter's Mill, Calif., the exact spot where gold was discovered back in 1848, triggering the gold rush. And so follows a story of serendipity and scientific discovery.

"I was out on my hillside burning some branches and so forth, and I heard this sonic boom," says Gold Country resident Ed Allen. "It wasn't just one boom. It was a series of booms, literally right over my head."

Have you noticed, perhaps, that some of your store-bought salad dressings or spaghetti sauces taste a little less salty lately?

Probably not. The companies that make those products are doing their best to keep you from noticing. Yet many of them are, in fact, carrying out a giant salt-reduction experiment, either because they want to improve their customers' health or because they're worried that if they don't, the government might impose regulations that would compel more onerous salt reductions.