This is what those numbers really mean ...

Keeping your home clean is about finding the balance: minimum cleaning work for the maximum cleaning effect. Vacuuming is vital to this routine, as most of your home's dust, dirt, hair and other gunk ...

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.