Hundreds of millions of Chinese are now traveling home to celebrate the Lunar New Year. It's the largest human migration on earth -- and it stretches the country's transportation system to the limit.
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Lunar New Year is China's biggest holiday. Work stops, factories close and millions of workers flee the cities to be with their families in a temporary, annual reversal of the urbanization that is reshaping the country.
By Charles Riley @CRrileyCNN - Last updated February 07 2013 08:30 PM ET