Living near the city of Chicago you have probably had a chance to watch a skyscraper or two under construction.  For the first six months or so of the project, all the workmen do is make a big hole in the ground.  To build a tall building by starting below the surface level seems crazy.  But, as you would suspect, there is a good reason for the large hole.  To build a mammoth building that is going to be stable in the strong Chicago winds, it is first necessary to dig down......

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