In 536 AD, the world witnessed a devastating volcanic eruption. We now know it was equivalent to 10,000 Hiroshimas. In part two of History Labs: Catastrophe, author and archaeologist David Keys investigates the farreaching consequences of the volcanic eruption, discovering that the dust cloud thrown up by the eruption caused widescale cooling. Forensic science can now reveal that one consequence of this was the escalation of bubonic plague.

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