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Glass Cracks Below Tourists in Chicago Skydeck
The shattered protective coating of the Skydeck's floor. (Photo courtesy Alejandro Garibay via NBC Chicago) Participants stand on the new glass balconies suspended 1,353 feet in the air and jut out 4 feet from the Willis Tower's 103rd floor Skydeck on July 1, 2009 in Chicago. (Mashable; Image: Kiichiro Sato/Associated Press)

The shattered protective coating of the Skydeck's floor. (Photo courtesy Alejandro Garibay via NBC Chicago)
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The shattered protective coating of the Skydeck's floor. (Photo courtesy Alejandro Garibay via NBC Chicago)