Can You Trust Online Rating Systems?

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Thumbs up or thumbs down?  Researchers say online recommendation systems can be distorted by a minority of users.

When searching online for a new gadget to buy or a movie to rent, many people pay close attention to the number of stars awarded by customer-reviewers on popular websites. But new research confirms what some may already suspect: those ratings can easily be swayed by a small group of highly active users.

 

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The Most Polluted Cities in the United States

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Yay for Los Angeles! The City of Angels no longer holds the dubious title of the Sootiest City in the United States. That honor is now held by Pittsburgh (though LA is still the most polluted by other measures).The American Lung Association’s State of The Air 2008 report ranked metropolitan areas according to their ozone, year round and short-term particle pollution.

The most polluted cities, according to the short-term particle pollution measure are:

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