1854
Medicine
Britain
Broad Street pump and epidemiology
John Snow mapped cholera deaths to a single water pump in London.
Why it mattered
Founded epidemiology and the disease map.
Industrial Age
1854
2 recorded milestones at this point in the record.
1854
Science
Ireland
Boolean algebra
George Boole reduced logic to algebraic operations on true and false.
Why it mattered
The mathematics inside every digital circuit.
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