File 03 — Tools
Calculators you can just play with.
Small interactive instruments for the moment a feeling tries to pass itself off as a fact. Drag the sliders. The point is to feel it, not to be told.
The one worth using first
Panic-to-Probability Converter
Turn a 2 a.m. fear into a number.
Name the fear, answer four questions about your prior, your sample size, and whether anything actually changed. It crosses out the catastrophe and rewrites it as a calmer reading of the evidence.
open the converter →Four ideas you can hold in your hands.
Each one makes a single idea obvious by letting you break it.
- 01Your Risk, in MicromortsWhere the danger actually is.Set your real life — how much you drive, fly, ride, your age — and watch where your risk truly comes from. A micromort is a 1-in-a-million chance of death; the mundane things you do constantly quietly outweigh the dramatic ones you fear. Every figure sourced.
- 02Dread vs. DataThe things you fear vs. the things that get you.Sharks, lightning, plane crashes, terrorism — the risks we dread most are usually the rarest, while the boring things quietly do the real damage. Compare them on one scale. Every number is sourced and hedged, because that's the whole point.
- 03How Common Is It, Really?Recognize what's actually frequent — and what just feels it.A quick guided check: where your sense of “common” comes from, whether you're over- or under-counting, and how to find a real base rate instead of a felt one. Handles both traps — the loud-but-rare and the quiet-but-everywhere.
- 04The Base-Rate MachineWhy a positive test usually isn't.Drag two sliders — how common a thing is, and how accurate the test is — and watch most “positive” results turn out to be false alarms. The rarer the thing, the more a single alarm lies to you.
- 05Signal vs. NoiseOne bad day, drawn out.Generate noisy data around a perfectly flat reality and watch alarming dips appear out of nothing. The fewer days you look at, the wilder the story. More data, calmer story.
- 06The Belief UpdaterMove your mind the right amount.Set a starting belief, then add evidence and watch it slide — proportionally, never leaping straight to certain. Strong evidence on a low prior still only gets you to “likely.”
- 07The Calibration GameAre you as sure as you think?Give a 90%-sure range for a handful of facts, then see how often the truth actually landed inside. Almost nobody hits 90% — most of us are quietly, confidently overconfident.