The director of the National Park Service doesn't have anything against hot dogs or pizza being served in eateries in national parks.
"But I wanted more options, and more healthy choices," Jonathan Jarvistold me at a tasting event this week to unveil new standards for the concessionaires who operate more than 250 food and beverage operations in national parks.
This is SCIENCE FRIDAY. I'm Ira Flatow. In the disease multiple sclerosis, the body's own immune cells stage a mutiny. Those cells, white cells, normally go after foreigners in the body like bacteria or other invaders that make us sick. But in MS, the immune cells go after the body itself, attacking the myelin covering that wraps around nerve cells. As that myelin gets degraded, nerve signals don't get transferred properly, and that's what leads to the symptoms of MS.
This is SCIENCE FRIDAY. I'm Ira Flatow. Up next, surviving the big one, and I mean a really big one. As any fan of dinosaurs knows, extinction happens. The Earth isn't immune to assaults. You've got your asteroids, your volcanic eruptions, events that cause so much disruption to the environment that eventually life or most of life is wiped out.
California's San Onofre nuclear power plant will be shut down for good amid concerns as to whether it could be safely restarted after being offline since early last year because of a radiation leak.
The plant's operator, Southern California Edison, said in a statement Friday that San Onofre's twin reactors "had served the region for over 40 years" but that the 16 months of uncertainty about whether they would or wouldn't go back online "was not good for our customers, our investors or the need to plan for our region's long-term electricity needs."
In his most extensive comments so far on the revelations this week about the electronic data that the nation's spy agencies are collecting, President Obama told the American people Friday that "nobody is listening to your telephone calls."