Enrico Fermi was able to do perform a similar estimate, based on the distance traveled by pieces of paper he dropped from his hand during the blast - https://en

Enrico Fermi was able to do perform a similar estimate, based on the distance traveled by pieces of paper he dropped from his hand during the blast - https://en.wikipedia.org/wiki/Fermi_problem https://en.wikipedia.org/wiki/Fermi_problem