<img src=”https://naked-science.ru/wp-content/uploads/2025/02/photo_2025-02-26_17-05-50.jpg” alt=”Hot ash from Vesuvius turned the brain of a Herculaneum resident into glass”/>An international group of scientists has described a unique case of human brain tissue turning into organic glass during the eruption of Vesuvius. Fragments that look like obsidian were previously found in the skull of one of the victims of the natural disaster in the ancient Roman city of Herculaneum. Like Pompeii, it was buried under a layer of pyroclastic flows in the fall of 79 AD.