I'm a little surprised that all the comments thus far and the article itself never used the term "Fermi Problems". Whether or not someone calls them a braintea

I'm a little surprised that all the comments thus far and the article itself never used the term "Fermi Problems". Whether or not someone calls them a brainteaser is up to them I guess. I too think of brainteasers as trick questions with some gotcha answer that you normally wouldn't think of based on how the question was phrased. Fermi problems aren't in that category for me either.