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There are an estimated 20 million to 30 million surveillance cameras in China — or about one for every 43 people. Officials say the cameras help fight crime and maintain "social stability." But critics say the government uses them to monitor and intimidate dissidents.

Alan Alda founded The Flame Challenge last year to promote better science communication, and he started by asking scientists to come up with a kid-friendly explanation for a flame. Now, Alda is back with round two of the popular contest, and kids want to know: What is time?

Colombia's government has announced peace talks with the Revolutionary Armed Forces of Colombia, or FARC, a Marxist insurgency that has been fighting a brutal conflict for nearly five decades. But memories of previous, unsuccessful attempts at peace are still fresh for civilians in the rebels' mountainous heartland.

Justin Timberlake rocketed to stardom as a teen heartthrob in the band 'N Sync. He has gone on to be a successful solo artist — and expanded his career into both comedic and dramatic roles on-screen. He discusses his long career in showbiz, his SNL digital shorts and his transition to film.

A deadline is approaching for lawmakers to undo an Obama-era regulation that aims to limit the emissions of methane — a powerful greenhouse gas — from energy production sites on public lands.

China has become the biggest lender on the African continent. The Nairobi-to-Mombasa railway is a symbol of Kenya's ambitions. But critics say China is saddling Kenya with unsustainable debt.

More than 70 New York City restaurants are pouring their discarded shells into the Billion Oyster Project, through which students recycle and transform them into healthy reefs in once-toxic waters.

The new president was a fierce critic of Barack Obama's foreign policy during the presidential campaign. Here's a look at the difficult issues he has just inherited.

Smith, who died on Friday, was a Methodist minister who traveled the world studying Christianity, Judaism, Islam, Buddhism, Confucianism, Hinduism and other religions. Originally broadcast in 1996.

The memoir of the Motown group's co-founder, Otis Williams, plays out in Ain't Too Proud. Although the successes of the fractious group came at a cost, Williams says the power of their music lives on.