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Airs Thursday, November 25, 2010 at 3 p.m. on KPBS TV

There's no place like it on the planet: White Sands National Monument in New Mexico. It's the world's largest gypsum dunefield: miles and miles of stunning white landscape.

They don't have wings, but bacteria sure can fly. Researchers at MIT say that tiny bubbles trapped by raindrops play a part in launching bacteria on long-distance flights.

They don't have wings, but bacteria sure can fly. Researchers at MIT say that tiny bubbles trapped by raindrops play a part in launching bacteria on long-distance flights.

A new report says a woman in Liberia likely contracted the virus after unprotected sex with a man who had survived the disease. The reason may lie in the immune response of the testicles.

Under a cloud of secrecy, the island's top leaders are gathering for a party meeting that may usher in the beginning of the post-Castro world.

A campaign to legalize street vending is gaining strength from local resistance to President Trump's immigration policies — and fears that infractions could lead to deportation.

The apple renaissance of recent years has given us new varieties of fruit. But that's only half of the story, and half of the tree. Another revolution is happening below ground, in the tree roots.

"Portions of St. John are scheduled to be restored by the middle of next week," the power utility says. The U.S. Virgin Islands — home to more than 100,000 Americans — remains under boil-water orders.

South Africa's president is on the ropes after a controversial reshuffle of his cabinet replaced a respected finance minister with an unknown. Support from the all-powerful unions is wavering.