On April 10, 1815, Mount Tambora erupted on the island of Sumbawa. It was the largest eruption in recorded human history — ten times more powerful than Krakatoa, a hundred times more than Mount St. Helens. Tambora lost a third of its height in minutes and threw 150 cubic kilometers of rock into the atmosphere.

The dust stayed up there. It wrapped around the globe and blocked sunlight for over a year. 1816 became known as 'the year without a summer.' Snow fell in June across New England. Crops failed across Europe, triggering the worst famine of the nineteenth century. Typhus outbreaks followed hunger, killing another hundred thousand.

In Switzerland that summer, the weather was so terrible that a group of young English writers stuck inside a villa on Lake Geneva invented a competition: who could write the most frightening story? Mary Shelley, aged eighteen, dreamed of a scientist animating a corpse. The result was Frankenstein — published two years later and still in print today. Lord Byron, at the same villa, drafted the dark poem 'Darkness' about a sun that refuses to shine.

The weirdness rippled further. J.M.W. Turner painted his famous orange sunsets from skies genuinely colored by Tambora's ash. Impressionism's interest in light owes something to a volcano. Modern climate science learned from Tambora that a single event can tip global temperature by a full degree — which is roughly what we're now doing on purpose, every decade.

One mountain exploded. Culture, science, and climate still carry the echo.