Just in case the public wasn't sufficiently convinced by a journalist smashing the world's longest and highest glass bridge with a sledgehammer (and surviving), the owners of the Zhangjiajie Grand Canyon bridge in China decided to prove its safety by upping the ante over the weekend. In its latest media-directed "safety test" of the 430-meter bridge, suspended a heart-stopping 300 meters above a gorge, the Zhangjiajie national park's owners had 20 volunteers swing sledgehammers at the glass, making visible cracks in the top layer. Like many other glass bridges and viewing structures across the world, the Zhangjiajie bridge's glass panels are made of multiple layers, so visible cracks don't mean the panels will give way. Zhangjiajie's three-layered glass panels measure 3m by 4.5m, and each layer is 15mm-thick. ...
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