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Wall Street Fighting Mathematics #1
Why the Rule of 72 works: logarithms, Taylor expansion, inflation adjustment, target wealth horizons, and the limits of the heuristic.
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A Faster Route to Pi
From coprime integers to quantum algorithms, an indirect but exact route to pi.
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How Far Away Is a Storm?
Why counting the seconds between lightning and thunder gives a reliable estimate of storm distance.
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The Tap Is On. The Permit Is Not.
Arizona does not run out of water all at once. Its rules decide which demand counts, where, and under what right.
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The Sweater and the Calendar
Framework made a sweater in Los Angeles. The public case for domestic automated knitting depends less on labor minutes than inventory timing.