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As the world's population tops 7 billion people, population experts are worried about inevitable increases in cars, computers, bigger homes and a drain on resources. In an effort to combat this, one California company is producing small, energy-efficient homes — some as tiny as 300 square feet.

Sure, a disgraced politician like Anthony Weiner can probably score a cable talk show. But can he resurrect his political career? A look at how five other scandal survivors have fared.

In his career as governor of Texas, Rick Perry has raised about half his campaign cash from just 204 big donors. One of them, Harold Simmons, has given Perry roughly $3 million of support. And in recent years, Simmons' company has gotten a license to operate a radioactive waste site, despite environmental concerns.

Professor Jordan Ellenberg gives students points for recognizing when they get a wrong answer, even if they can't figure out why. In his new book, he writes that good math is about good reasoning.

A new NPR poll concentrates on the Senate battleground — the 12 states that will determine control of the Senate next year. It found an electorate where nobody likes anybody.

From his base in Shanghai, Frank Langfitt covers everything from the missing Malaysian airliner to why the Chinese are wild about Sherlock.

John Boehner finds himself in a position he had hoped to avoid all year. With no deal on the budget, questions about whether he can effectively lead the House will only grow louder.

Jack Lew is known as a smart, unassuming budget wonk who has spent most of his career in government policy-making jobs. Lew, President Obama's nominee to be Treasury secretary, is expected to face questions about his management years at Citigroup before the government bailed out the banking giant.

Russian researchers in Antarctica are on the verge of piercing a hole through two miles of ice into an ancient lake, untouched by the light of day for some 20 million years. But it'll be a delicate process to break through without disturbing the pristine waters. Guest host David Green speaks with Antarctic researcher John Priscu about the process.

Roughly half of Facebook's users check in on smartphones and other mobile devices every month, but so far the company isn't making money on mobile. That's one of the potential pitfalls for the company as it prepares to sell its stock to the public.