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In the 1920s, housework
Silica
A tough, inert, and colorless substance found as quartz in nature and as a major component of sandstone and various other stones.
Coal Dust
Fine particulate byproduct of coal processing that can pose health risks when inhaled.
Antibiotics
Medications used to prevent and treat bacterial infections by either killing the bacteria or inhibiting their growth.
Common Cold
A viral infection of the upper respiratory tract, characterized by sneezing, sore throat, coughing, and congestion.
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