How large a gathering is too large during the coronavirus pandemic?

The math of social networks can create a roadmap to a group size that still curbs spread

Sign warning people not to use a playground in Washington

In Everett, Wash., local officials have cordoned off a playground to prevent groups from congregating there. States and municipalities across the country are taking similar steps, including banning or setting maximum size limits on all gatherings, to prevent transmission of the coronavirus.

Cindy Shebley/Flickr (CC BY 2.0)

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