Black Death plague returned every generation Europe

Plague returned to Europe for centuries

The Black Death killed an estimated 25 million people, about a third of Europe’s population at the time. Plague is thought to have returned roughly every generation, with varying severity, until the 18th century.

China opened Silk Road routes partly in search of better horses

China's Han rulers expanded into Central Asia through war and diplomacy while also seeking valuable goods, including the prized horses of Ferghana. These efforts helped open lasting routes between China and the wider trade networks later called the Silk Road.

Land plants made wildfires possible

Wildfires became possible after land plants helped raise the amount of oxygen in Earth's atmosphere above about 13%. Fossilized burned plants show that fires were already happening around 420 million years ago.

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Black Death plague returned every generation Europe

Plague returned to Europe for centuries

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