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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.

Fruit Ninja. Bejeweled. Plants vs. Zombies. These are all top-grossing apps through Apple's app store. Plenty of folks dream about creating the next mobile application smash hit. But the latest group of tech entrepreneurs — some not even old enough for a learner's permit — are going after their slice of the pie.

Some commodities analysts were warning earlier this year that gasoline could hit $6 a gallon by the end of the summer. Instead, the national average has fallen steadily since May. Experts say the drop is due to three main factors.

Some commodities analysts were warning earlier this year that gasoline could hit $6 a gallon by the end of the summer. Instead, the national average has fallen steadily since May. Experts say the drop is due to three main factors.

In Libya, refugees are streaming out of Sirte, the last major town still in the hands of forces loyal to ousted dictator Moammar Gadhafi. Cut off from the rest of the country, without electricity, many knew nothing of recent rebel advances, including the fall of the capital, Tripoli.

In Libya, refugees are streaming out of Sirte, the last major town still in the hands of forces loyal to ousted dictator Moammar Gadhafi. Cut off from the rest of the country, without electricity, many knew nothing of recent rebel advances, including the fall of the capital, Tripoli.

The nation's for-profit colleges and universities received more than $1 billion in benefits from the Post-Sept. 11 GI Bill in the last year alone. But some say the for-profit schools aren't policed well enough — which creates an opening for abuses — and their dropout rates are too high.

The nation's for-profit colleges and universities received more than $1 billion in benefits from the Post-Sept. 11 GI Bill in the last year alone. But some say the for-profit schools aren't policed well enough — which creates an opening for abuses — and their dropout rates are too high.

While carbon dioxide streams into the atmosphere from tailpipes and smokestacks around the world, one man is building a machine to suck it back out. And some heavy-hitting investors are betting that it's going to work.

While carbon dioxide streams into the atmosphere from tailpipes and smokestacks around the world, one man is building a machine to suck it back out. And some heavy-hitting investors are betting that it's going to work.