By now we can probably all agree that wearing a mask while indoors is a no brainer. But maybe you’ve found yourself out hiking on the trails or biking down the street and wondered—should you mask up when you cross paths with other people, even when you’re outdoors? Science shows that the risk of contracting COVID-19 outdoors is low, but that doesn’t keep Bill Nye the Science Guy from masking up.

In an interview with Conde Nast Traveler, Nye says that if you’re going on a hike on a fairly empty trail, you should wear your mask when someone approaches within 30 feet. On a busier trail, says Nye, you should wear your mask the entire time you’re hiking. “If you’re finding it hard to breathe, slow down,” he told Conde Nast Traveler. “Dying is a big price to pay for trying to keep up with what you might