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Yhn ScienceBiology first seen 16 h ago, last 23 min ago, peak #7

The Bologna Bottle: Glass So Fragile It Shatters From Within

Original: Bologna Bottle

The Bologna bottle is a 17th-century glass curiosity made in Bologna, Italy. It looks solid and can withstand blows to its outside, yet shatters into fragments when a small object is dropped inside or its interior is scratched. The effect comes from uneven cooling during manufacture, which leaves internal strains in the glass.

Why now: Readers are sharing this as a surprising example of how manufacturing stresses can make an object tough on the outside but fragile inside.

BolognaBologna bottle

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