Dr. Elizabeth Yuko is a bioethicist and adjunct professor of ethics at Fordham University. She has written for The New York Times, The Washington Post, The Atlantic, Rolling Stone, CNN & Playboy.

There's nothing cozier than a glowing fireplace on a chilly evening. But over time, that beautiful view can become clouded with soot, haze, and stubborn residue that can dull the flame's warm glow.