Sketchplanations - The Podcast Microlives & The Art of Uncertainty with Sir David Spiegelhalter
Dec 2, 2025
Sir David Spiegelhalter, Emeritus Professor of Statistics at the University of Cambridge and author of The Art of Uncertainty, dives into the fascinating concepts of micromorts and microlives, quantifying risks associated with daily choices like smoking or skydiving. He shares insights on the importance of randomized trials in medicine and the human struggle with uncertainty. David also discusses how acknowledging uncertainty can build public trust, and explores the intersection of stats and everyday life, all spiced with engaging anecdotes and practical tips.
AI Snips
Chapters
Books
Transcript
Episode notes
Micromorts Make Acute Risk Comparable
- A micromort equals a one-in-a-million chance of sudden death and helps compare acute risks across activities.
- Many voluntary activities cluster around 5–10 micromorts, a level people commonly accept for fun or exercise.
Microlives Quantify Lifestyle Trade-Offs
- A microlife is defined as half an hour of life expectancy lost on average from a habitual behaviour.
- Small daily habits like two cigarettes or two hours of TV accumulate and can be added to compare lifestyle trade-offs.
Exercise Buys You Time
- Gain microlives by exercising: roughly half an hour of moderate exercise equals one microlife.
- Increase daily activity from sedentary to 20–30 minutes to materially boost life expectancy.
