The lesson of empires: One falls, another ascends. This winter, a Mexican branch of Wal-Mart opened a store in the shadow of the Aztec's pyramid of the sun. (Chanting) Even as Mexicans wandered the ...
Recent outbreaks in the U.S. have drawn attention to the dangers of measles. The Democratic Republic of Congo is fighting a deadly outbreak of Ebola that has killed hundreds. Epidemics are nothing new ...
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