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The challenge, launching during the SXSW festival Saturday, asks anyone with an Internet connection to try to create a rocket engine. The 3-D designs can be edited by users around the globe, a model the organizers hope will decrease the cost of space innovation and unleash "untapped potential around the world."

North Korea has been ratcheting up the rhetoric against South Korea and the United States. Analysts say the secretive nature of the country make it difficult to judge its intentions and capabilities, however.

An estimated 80,000 American prisoners spend 23 hours a day in closed isolation units for 10, 20 or even more than 30 years. Now, amid growing evidence that it causes mental breakdown, the Federal Bureau of Prisons has decided to review its policies on solitary confinement.

President Obama spent part of the weekend reaching out to members of Congress. He's still looking for some alternative to the budget cuts that he ordered on Friday.

The continuing resolution allows Congress to carry over the previous fiscal year's budget into the next one. And if Congress doesn't pass one by March 27, the government will run out of money and likely shut down.

Kenya's presidential election has yielded hundreds of thousands of spoiled ballots — and raised the possibility of a contentious and costly runoff election in April. Amid allegations of vote-rigging, there are others who say there may be a more innocent reason for so many rejected ballots.

The stock market's long climb has some people concerned it may be a bubble about to burst — a bubble artificially pumped up by the Federal Reserve's easy-money policy. That's led to calls — even from within the Fed — for an end to the central bank's extraordinary efforts to keep interest rates low.

The Amplify tablet is specially designed for K-12 classroom interaction. While the company touts the ability to improve teaching and learning, critics have questioned News Corp.'s motives.

Kenichi Togawa was working at the Fukushima Dai-ichi nuclear power plant in Japan the day the earthquake and tsunami struck. His family is still living in temporary housing. For many people, the stress and isolation brought on by the disaster could pose more persistent hazards than the radiation.

Chains like H&M and Forever 21 turn out new styles so quickly that they've been dubbed "fast fashion" retailers. While the stores reap big profits, many say the business model has hidden costs, like encouraging poor labor practices and churning out cheaply made products that quickly end up in landfills.