Archive category

Scientific breakthroughs

Discoveries and observations tied to a particular place.

2 mapped events

Chaos Files

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Epidemics & public health Well supported

August–September 1854

The Broad Street Cholera Investigation

The former Broad Street pump, now Broadwick Street, Soho, United Kingdom

During a severe cholera outbreak in Soho, physician John Snow mapped deaths and interviewed residents about where they obtained water. The concentration of cases among people who …

Open Chaos File

Unexplained & unusual Mixed evidence

30 June 1908

The Tunguska Event

Forest near the Podkamennaya Tunguska River, Russia

A brilliant fireball and immense atmospheric explosion occurred over a remote part of central Siberia. The blast flattened trees across a vast area but left no obvious …

Open Chaos File