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.

Researchers who examined the remains of a man whose brain was purported to have turned into glass when he was killed nearly 2,000 years ago in the volcanic eruption of Mount Vesuvius say they have

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.