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As extreme temperatures blaze across the nation, parks are taking extra measures to keep visitors safe

We dunked 19 filters across the country, from silty streams in California’s Agua Caliente Creek to clear lakes in Washington’s Olympic Mountains, to find the year’s best.

A group of researchers from University of California at Irvine investigated the link between SAR incidents, park visitation, and Twitter posts. Their conclusions could inform how hikers portray their own adventures—and view those of others—online.

We’ve come a long way from the chlorine troughs of yesteryear