A free app from Brown University researchers reveals your risk of getting COVID-19 based on your activity and zip code

A man wears a face mask while exercising.
Roberto Serra/Iguana Press/Getty Images
Public guidance about how to lower your risk of exposure to COVID-19 isn't always clear.
So physicians and researchers at Brown created an app to help Americans determine the risks of various activities. 
The app relies on six metrics, including ZIP code and the type of activity (like church service, mall trip, or gym workout).
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As doctors, Megan Ranney and L