Mother-in-law's tongue - Let's begin with a fun little plant with a curious name. Mother-in-law's plant, also called snake plant, is a yellow-tipped succulent that releases oxygen at night. It is known to be one of the best indoor plants for filtering the air of formaldehyde, xylene, benzene, toluene, and trichloroethylene. Better air quality and better sleep. How not to kill your mother-in-law's tongue? Although