Fermi Estimation (By Ted-Ed) [video]

If you eyeball power of 10 at the top and bottom of a fraction. The over and under estimates tend to cancel out and you will end up with a surprisingly small logarithmic error.

More videos:

Kyle Hill: https://www.youtube.com/watch?v=INlPbfBGPtw

Some random talk/lecture: https://www.youtube.com/watch?v=EMQd-AYb1fs

More articles:

- Trinity Test Eye Witness Report by Fermi: https://www.dannen.com/decision/fermi.html (Last HN discussion: https://news.ycombinator.com/item?id=14480550)

- Wikipedia: https://en.wikipedia.org/wiki/Fermi_problem

Some random lists of Fermi Problems I found:

- https://navajomath.math.ksu.edu/wp-content/uploads/2015/03/f...

- https://www.physics.umd.edu/perg/fermi/fermi.html

The only prerequisite for being good at Fermi Estimation is memorizing/getting and intuition about the world around you, and knowing what exactly you are trying to estimate.