I knew it, I knew it, that so called “unbreakable glass” they use on skydecks, so you can step out from the ledge, can friggin break. A group of people on the 103rd floor Willis Tower’s Ledge can vouch for that. Dear god, the top layer of the half inch glass cracked when some poor unsuspecting tourist stood on it….hell no. A spokesman said it was all cool , only one layer of glass had broken and no one was in any danger. Hmm, hello the deck only has three layers!!!