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How fast can we build a skyscraper?
In The Jetsons (set in 2062), George and Mr. Spacely are taking a half-minute out to watch a skyscraper go up (the whole thing!). Mr. Spacely says something like "I remember when it took a whole hour to put up a skyscraper."
What is the fastest we can put up a skyscraper now (I would imagine that it would be the Chinese who could do this, although I might be wrong)?
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