Our Perpetual House Guests

When we think of pests, we may think of the obvious: ants, mice, spiders, cockroaches. But what about the life we can’t see? And what about the ones that are actually helping us out? Host Kevin O'Connor speaks with ecologist, author, and professor Rob Dunn about the visible -- and invisible -- creatures we live within our homes and how there’s no amount of cleaning that can keep some of them out.
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