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Click to read Daniel Fetz, a Substack publication. Launched a year ago.
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How Many People Have Ever Lived in the United States?
On July 4, 2026, the United States turns 250. This anniversary made me think about how many people it took to build this country, and how many of them are no longer here to see what it has become.In other words: how many people have ever lived in the Unit
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Daniel Fetz Substack
The school of the future should resemble a miniature city. It's up to us to make it happen.
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How Fermi Poker Fosters Cognitive Empathy
Classic Fermi problems ask you to make a quick, order-of-magnitude estimate of something seemingly unknowable: Chicago's piano-tuner count, the number of new cars sold in the United States, or (more depressingly) how many chickens were killed for meat las
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