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Airs Sunday, February 28, 2010 at 11 p.m. on KPBS TV

Airs Sunday, August 28, 2011 at 8 p.m. on KPBS TV

Airs Saturday, February 27, 2010 at 2 p.m. on KPBS TV

Freeway lids can make freeways disappear in urban neighborhoods, but only if cities are willing to pay the price.

Until fairly recently, joining the Peace Corps usually meant living in a remote location and leaving behind family, friends and way of life. But mobile devices and the Internet are changing how volunteers serve -- and how they keep in touch with home. This connectivity is helpful for the volunteers, but not always for the Peace Corps staff.

Last month San Diego Coastkeeper coordinated the 26th annual Coastal Cleanup Day. Volunteers gathered at 80 different sites from Oceanside to Alpine to Tijuana. San Diego Coastkeeper weighed and surveyed the trash and will join us to analyze what was collected this year. We'll hear about the strangest items found (last year this list included an ATM machine), what type of trash is most pervasive and what all this rubbish does to the health of the ocean and bays.

The "Pope of Trash" reflects on his infamous film about the "filthiest person alive."

Airs Wednesday, August 3, 2011 at 9 p.m. on KPBS TV

Scientists say they've developed a technique that reconnects the severed ends of a nerve, allowing it to begin carrying messages again very quickly — at least in rats. Usually, severed nerves must regrow from the point of injury — a process that can take months, if it ever happens.

Spontaneous gatherings, organized through Facebook or Twitter, began innocently enough, with hundreds of people dancing to Michael Jackson's "Thriller" in Times Square or pillow-fighting in San Francisco. But in a number of cities, flash mobs have grown unruly and led to vandalism, theft or violence, police say.