Return of the pox: How smallpox eradication cleared the way for new threats

When Dr William Foege died earlier this month, the world mourned the loss of a scientist who helped rid humanity of a virus that had plagued the Earth for thousands of years.
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The Aztec empire's collapse shows why ruling through coercion and force fails

When Aztec emissaries arrived in 1520 to Tzintzuntzan, the capital of the Tarascan Kingdom in what is now the Mexican state ...