Chicago's black politicians building own dynasties

In a city where the mayor holds the same job his father once did, politics can seem little different from the years of the legendary Democratic Machine. But the faces of political privilege — long dominated by white ethnic groups — have changed as powerful black politicians use their clout to build new dynasties.

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The demise of some of China's ruling dynasties may have been linked to changes in the strength of monsoon rains, a new study suggests. The findings come from 1,800-year record of the Asian monsoon preserved in a stalagmite from a Chinese cave.

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