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The accuracy of order of magnitude estimations comes from the balance of under estimates and over estimates. Work through a few Fermi questions and purposely skew some of your responses. Does this affect your final estimation?The University of Maryland maintains a site dedicated to Fermi Problems. You can see them here: example of a Fermi-like-problem is the Drake Equation. It tries to estimate the number of intelligent life in the universe. See a TED-Ed lesson about it here:
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