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.
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.
As President Obama and his Chinese counterpart prepare for a weekend summit in California to discuss thorny bilateral issues, a new poll shows that ordinary Americans and Chinese increasingly eye one another with suspicion.
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."
This is TELL ME MORE from NPR News. I'm Celeste Headlee. Michel Martin is away. Coming up, we speak with a Pulitzer Prize-winning photographer who just lost his job after 44 years at the Chicago Sun-Times. But first, speaking of jobs, the latest figures are out from the Department of Labor. The U.S. economy added 175,000 jobs last month. That's the good news. The bad news is the unemployment rate rose to 7.6 percent. How does that math work? We're going to talk about that.