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After the "underwear bomber" incident on Christmas Day, President Obama accelerated the deployment of new airport scanners that look beneath travelers' clothes to spot any weapons or explosives.

Privacy isn't the only concern some have about the new low-energy X-ray scanners introduced at airports across the country. A group of scientists say the amount of radiation the scanners emit may have been understated and wants a more thorough look at the risks of exposing so many travelers to X-rays.

China's Shenzhou 9 spacecraft docked successfully with the orbiting Tiangong 1 test module this week, ticking off another accomplishment for the country's manned spaceflight program. Jonathan McDowell and Joan Johnson-Freese discuss the future of China's space program, and whether a new space race is heating up.

A major new housing development in Mission Valley could be a sign that San Diego County’s dormant new-home construction industry is coming back to life. The project is transforming an old gravel pit into a planned community of condos, rental units and commercial space.

Newt Gingrich made a fortune from the businesses he started after leaving Congress in 1999. Washington Post reporter Karen Tumulty explains how Gingrich "transfigured himself from a political flameout into a thriving business conglomerate."

In film and TV, pop culture references are meant to give a knowing nod to those in the audience who understand the joke. But in an increasingly segmented and diverse country, those jokes may be pulling in fewer laughs.

Read an exclusive excerpt of Allen Salkin's new history of the Food Network, From Scratch. It's an affectionate but unsparing look at a scrappy little startup network that became a national broadcasting behemoth — and brought people like Emeril Lagasse and Rachael Ray into millions of homes.

There are now 7 billion people, according to the U.N.'s population division. That prompts a question: Who else is in the 7 Billion Club? To learn which other animals had reached that plateau, we asked wildlife experts — who said it's a tough call.

The night wasn't about kitsch for her. Writer Danyel Smith fulfilled the real dreams of her 13-year-old self when she saw the pop singer live on Broadway.

Commercial trucks are becoming the preferred way to smuggle drugs across the U.S.-Mexico border, the Department of Homeland Security says. Each day, 4,500 trucks cross the World Trade Bridge in Laredo, Texas, but customs agents only inspect 1 in 5. From there, via Interstate 35, it's a straight shot to America's heartland.