The risk levels of everyday activities like dining out, going to the gym, and getting a haircut, according to an infectious-disease expert

Coronavirus transmission is not black and white — some activities are riskier than others, while some should cause little worry.

As states start to reopen parts of their economies and people tire of an all-out quarantine, the risk level of various activities should be considered to make decisions about what's safe and what should be avoided.

Julia Marcus, a Harvard Medical School professor, recently argued in The Atlantic that we should remember that risk is not binary and that an abstinence-only approach won't help. "Likewise, asking Americans to abstain from...