We did a survey sampling covering 0.00007% of the world, we estimatet that there are 1.7 billion buildings in the world with 90% confidence interval from [0.9 billions to 2.5 billions]
See the paper github.com/svendvn/sampling/
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3. The Twin Towers, the Pentagon, and the World Trade Center.
That would depend on what size buildings you want to build.That would depend on what size buildings you want to build.That would depend on what size buildings you want to build.That would depend on what size buildings you want to build.
There's no correct answer to this question. All buildings are different.
There are hundreds of buildings around the world that can fit 18000 people quite easily. Many sports stadiums or halls hold tens of thousands; most skyscrapers have upwards of 20000 workers in them daily.
they are used in many ways like for making buildings, ships,in hospitals for x-rays and many more...