The idea of houseplants cleaning indoor air has been around for a while, backed by NASA research. And it's always made a certain amount of sense. But I was thrilled to find this video from the TED (Technology, Entertainment, Design) conferences. It features Indian researcher Kamal Meattle discussing how an arrangement of just three different kinds of plants can have a strong impact on the air in your home. Have a look, and then check out our article on building "living walls" in your home.

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