The first fire extinguisher model sounds more dangerous than the fire: a cask that held liquid and a pewter gunpowder chamber connected to fuses. At the first flicker of flame, the alert 18th-century homeowner lit the fuses to ignite the gunpowder, which exploded, scattering the liquid retardant. Today, U.S. homeowners douse 13 million fires every year with extinguishers that use compressed air to spray foam, mono-ammonium phosphate or sodium bicarbonate. (via Popular Mechanics)
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