The eruption of Mount Vesuvius in 79 AD destroyed the Roman cities of Pompeii and Herculaneum. Vitrification is the transformation of a substance into glass. Researchers have now discovered a rare instance of a human brain being turned into glass due to the extreme heat and rapid cooling during the eruption. - Researchers found a dark, glassy material inside the skull of a man who died in Herculaneum during the eruption of Mount Vesuvius. - The vitrification process is attributed to the intense heat of the ash cloud followed by rapid cooling. - This is the only known example of a vitrified human brain from the Vesuvius eruption. - The discovery provides insights into the extreme conditions and unique effects of the volcanic eruption.