Heating drys out indoor air and, consequently, nasal passages, making it easier for germs to infiltrate your defenses. "But plants can act as natural humidifiers and, unlike the electrical kind, don't have to be cleaned," says B.C. Wolverton, an environmental scientist, formerly with NASA. He recommends those that need a lot of water (and therefore give off lots), such as rubber plants.
Credit: Getty Images
The 2014 Adventure Issue
From Iceland's Highway 1 to Utah's Canyonlands, an epic itinerary for modern explorers.
Plus: Building a Bigger Action Hero
ON NEWSSTANDS NOW
Duke Lacrosse and the Fog of Scandal
How Thailand's Most Notorious Prison Became a Fight Club
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