COVID-19 surface transmission air spread

COVID-19 spreads mainly through the air

SARS-CoV-2 can survive on surfaces, but contact with contaminated surfaces is not a main way COVID-19 spreads. In most situations, the CDC says cleaning with soap or detergent is enough to reduce the risk from surfaces.

Some elevators send electricity back to the building

An elevator can return electricity to its building when a cab heavier than its balancing weight descends, or a lighter cab rises. The motor then acts as a generator, recovering gravitational energy much like regenerative braking in a vehicle.

The 13th Amendment left a forced-labor exception

The U.S. 13th Amendment abolished slavery but allowed forced labor as criminal punishment. That exception provided a legal basis for convict leasing, a practice that primarily affected African Americans.

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COVID-19 surface transmission air spread

COVID-19 spreads mainly through the air

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