French designer Mathieu Lenhanneur and Harvard engineering professor David Edwards invented a purifier that filters air through houseplants roots, soil and water supply. Foliage in the living quarters always makes the space a bit more environmentally friendly, right? They call this device the Andrea. This is the first award-winning air filter that also boasts credit through independent test and customer reviews. Tests prove that this device proved 4,400% more effective at removing toxic gases, such as formaldehyde and improving air quality.