Benchmarks: July 4, 1054 — Birth of the Crab Nebula (American Geosciences Institute)

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Earth & Climate Natural Disasters

A volcanic mudflow buried the Colombian town of Armero

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Space Stars & Galaxies

Skywatchers logged the supernova that became the Crab Nebula

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Earth & Climate Weather & Climate

Nations signed the Montreal Protocol to save the ozone layer

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