Mount Vesuvius was so hot it turned a man’s brain into glass when it erupted, fascinating new research shows. A piece of dark glass was found in the man’s skull, who died in the Roman city Herculaneum almost 2,

The eruption of Mount Vesuvius 2,000 years ago turned a victim’s brain tissue into glass. Scientists say they have figured out how this unusual phenomenon occurred.

It was a surprising discovery when scientists examining the remains of a man who died in bed in the ancient city of Herculaneum after Italy's Mount Vesuvius erupted in 79 AD found dark fragments resembling obsidian inside his skull.