NASA’s Suggestion on Growing an Indoor Garden

Grow an Indoor Garden Houseplants release blood-enriching oxygen, and the ones on this list can also cleanse your indoor air of chemicals, according to NASA research (conducted to find ways to clean air in space stations–cool!) They’re also black-thumb-proof. NASA’s suggestion: For a 1,800-square-foot house, place 15-18 of these plants in 6- to 8-inch-diameter containers….