Acrophobes, stop reading now. The Skydeck at Willis Tower, which lets tourists stand on a glass ledge more than 1,500 feet above Chicago, cracked under the weight of visitors late last night. Believe it or not, it's not that big a deal. Here's why.
Chicago's Willis (formerly "Sears") Tower is one of the tallest skyscrapers in the world — and yesterday it was scaled by amputee/bionic-badass Zac Vawter.