Chinese glass bridge cracks

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A glass bridge that hangs off a 3,500-foot bridge in China has cracked.

This glass-bottom bridge in China was already scary. But it got downright terrifying when a pane shattered.

Story by Tony Manfred and editing by Jeremy Dreyfuss.
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The top piece of glass is sacrificial in case it gets scratches or this case damaged by something like a steel cup, rocks from the wall, anything. The top piece gets removed and replaced easily.

MotoAtheist
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It is quite expected. Glass is a fragile material under impact loads of sharp objects. They can protect the glass with transparent silicon film - which is not translucent as glass - or remains fixing when things like that happen.

JonasSM