By removing the handle from the Broad Street water pump, John Snow demonstrated that disease could be transmitted by water and not just through the air.

Name: By removing the handle from the Broad Street water pump, John Snow demonstrated that disease could be transmitted by water and not just through the air.
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John Snow's removal of the Broad Street pump handle in 1854 helped demonstrate that cholera was waterborne, challenging the prevailing miasma theory that diseases were spread through "bad air."

By Removing the Handle from the Broad Street Water Pump