Stuff You Missed in History Class John Graunt
May 4, 2026
A curious 17th-century shopkeeper turns parish death lists into pioneering data tables. They trace how early record-keeping led to the birth of demography and epidemiology. Discussions cover methods for estimating population, early life tables, and how plague, overcrowding, and urban design shaped public health. The episode highlights scientific networks and the unexpected social fallout of Graunt’s work.
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How Graunt Turned Death Lists Into Data
- John Graunt transformed weekly London death lists into systematic analysis to reveal population patterns.
- He noticed others only glanced at totals, so he aggregated bills to compare years, parishes, causes, and seasons for real insight.
Searchers Were The Original Data Collectors
- Bills of mortality began in 1527 and were compiled by parish 'searchers' who examined bodies and reported deaths.
- Searchers were elderly women who rang for each death, listed numbers by parish, and later added causes despite limited medical training.
Graunt Acknowledged Messy Source Data
- Graunt documented data flaws openly, noting searchers' ignorance, bribery, and vague categories like 'old age' or 'infant'.
- He treated many entries as approximate, welcomed criticism, and adjusted methods accordingly.