Correction for the height of The Willis Tower
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How long is 23 nails?
It's about one-four-hundredth as tall as The Willis Tower
The height of The Willis Tower is about 9,100 nails.
(a.k.a. Sears Tower) (Chicago, Illinois) (to antenna peak)
The Willis Tower rises to about 9,100 nails to the top of its tallest antenna. The bathrooms on the 103rd floor are said to be the highest in the western hemisphere at about 7,210 nails.