Media Summary: Once we had the tools to erect tall buildings, their height was still limited by one thing: our willingness to walk up all those stairs.
Once we had the tools to erect tall buildings, their height was still limited by one thing: our willingness to walk up all those stairs.
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Elevator Safety Explained
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Once we had the tools to erect tall buildings, their height was still limited by one thing: our willingness to walk up all those stairs.
Explained