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The nation's next transportation bill should be written with its aging population in mind, advocates say. Their concern is that with pedestrians and cyclists already at risk, adding slower-moving senior citizens to a system built for cars could form a road safety crisis.

Nursing degrees have long been touted as the golden tickets to a job. But when the great recession hit, older nurses set to retire decided to keep working and part-timers moved to full time for extra income. So today's nursing graduates are encountering a far tougher job market than the one they were promised.

Stream now with KPBS Passport on KPBS+. Highlights include: a Temperance lithograph illustrating the evils of imbibing spirits; a letter from Gerald Ford to his kindergarten teacher who called him "naughty little Gerry Ford;" and a dress worn by Marilyn Monroe in the film "Some Like It Hot."

With the space crafts retiring to museums - including one in Los Angeles - it will be another three to five years at best before Americans are launched again from the U.S.

Key portions of the Kyoto Protocol are set to expire at the end of 2012. But many of the world's major greenhouse gas emitters have already set national targets to reduce emissions, and they're forging their own initiatives to meet those goals.

Curtis Wilkie is the author of The Fall of the House of Zeus, in which he chronicles the life of Dickie Scruggs, a trial lawyer who made millions in lawsuits targeting the asbestos and tobacco industries — and then wound up in prison for attempted bribery.

Electric cars are all the rage at the North American International Auto Show. The star of the Detroit show is the Chevy Volt, and there are plenty of others on display. Still, experts say electric cars will account for only a small sliver of sales for the foreseeable future.

When NASA wrapped up its spaceship programs Mercury and Apollo, it had new vehicles ready to replace them. But the agency has no such plan now that the space shuttles are retiring. Some people say it's a sign the organization has lost its way, but the agency's leaders say NASA has a robust future.

The Navy is building one of the largest photovoltaic systems in San Diego County funded by federal stimulus money. The solar project is sited on top of an old landfill on Camp Pendleton, known as the Box Canyon Landfill.

Earth's population crossed the 7 billion mark Monday. The growing population has been the subject of doomsday scenarios, but Colum Lynch worries that the U.S. and other wealthy countries will soon have too few citizens. He predicts the world population will decline by the end of this century.