> How does a virus spread primarily by aerosols/droplets travel 7 miles across a city of 10 million people? Presumably the same way it travels 25,000 miles acr

> How does a virus spread primarily by aerosols/droplets travel 7 miles across a city of 10 million people? Presumably the same way it travels 25,000 miles across a planet of 7.5bn people - via the people.