How a Volcanic Eruption Helped Unleash the Black Death in Europe in 1347

The flap of a butterfly's wings on one side of the world can cause a hurricane on the other, or so they say. If we take it a bit too literally, that old observation may make us wonder what a hurricane can cause. Or if not a hurricane, how about another kind of large-scale natural disaster?

Raccontata daopenculture.com