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Some solar devices, like calculators, only need a small panel of solar cells to function. But supplying enough power to meet all our daily needs would require enormous solar panels. And solar-powered energy collected by panels made of silicon, a semiconductor material, is limited -- contemporary panel technology can only convert approximately seven percent of optical solar waves into electric current.

But they'd like to do it with as little risk as possible. A majority of female business owners expect their companies to grow over the next two years, but most don't want to raise prices—and they'd like to avoid risk, says a new report. Four in five women hope to grow their businesses "substantially" or "at least a moderate amount" by 2013, according to a survey of some 700 female business owners done by PNC Financial Services Group.

The quadratic equation may have instilled horror in many of us. But for some five to seven percent of the population even basic math--like the concept of the numbers five and seven--causes anxiety. You may never have heard of the disorder called dyscalculia, yet it’s as common as dyslexia, according to research in the journal Science .