Stay 6 Feet Apart, We're Told. But How Far Can Air Carry Coronavirus? - The New York Times

Density Is New York City's Big 'Enemy' in the Coronavirus Fight - The New York Times

7 Covid Mysteries Scientists Are Starting to Unravel - The New York Times

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Fauci admits to Congress that COVID social distancing guidelines lacked scientific basis

Why six feet apart? Social distancing guidelines during coronavirus pandemic

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Social distancing - Wikipedia

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Stay 6 Feet Apart, We're Told. But How Far Can Air Carry Coronavirus? - The New York Times

Frequently Asked Questions

Social Distancing: What to Know and Why it Matters

If you get COVID on a family vacation, can others in the party avoid infection? : Goats and Soda : NPR

This 3-D Simulation Shows Why Social Distancing Is So Important - The New York Times