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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?

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.

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.

The Senate Conservatives Fund, founded by then-Sen. Jim DeMint, is a big-money player targeting incumbent Republican senators including Minority Leader Mitch McConnell of Kentucky.

Child boxing in Thailand is denounced by human rights groups, but it remains popular in some rural areas where it attracts large crowds betting large sums on the young fighters. For fighters like 9-year-old Chai Lorlam, the pressure to win is intense.

The plan could lower premium prices but also disproportionately hit low-income Americans.

Our resident chef likes to grill lobster, as opposed to boiling it, both for culinary and humanitarian reasons.

The city of Luliang, in China's coalfields, was to become home to a $5 billion business district. But corruption, reckless pursuit of growth and overcapacity led to a crash in its industrial economy.

The pontiff is the fourth to address the United Nations. He spoke extensively about climate change and the environment, equality of opportunity and international justice.

Dozens of games and apps claim to improve your memory or make you smarter or reduce stress. But do they really? Developers say the next step is clinically valid proof of cognitive gains.