how are the weight on the first floor of a skyscraper able to hold the weight of over a 100 floors?
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Imagine a tree. You want to build several platforms around the tree. Instead if building the second, third, fourth etc. platform on top of the first platform, you anker each platform on the tree trunk. So each platform is supported by the tree trunk. Same goes for building, only there are pillars (interior and sometimes exterior) which the floors are ankered to.
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