After how many folds is the thickness just over 4 feet?

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Q1.

What happens to the thickness of a sheet of paper after each fold?

Q2.

If the thickness of a paper is 0.001 cm, what will be its thickness after 4 folds?

Q3.

If you can fold a sheet of paper 10 times, what will be the estimated thickness?

Q4.

Estu claims it's impossible to fold a paper more than 7 times. Why might this be true for standard paper?