Even when the floors are sparkling clean and the house seems silent, our domestic domain is wild beyond imagination. Here biologist Rob Dunn introduces us to the 200,000 species living with us in our own homes, from Egyptian meal moths in our cupboards and camel crickets in our basements to the lactobacillus on our kitchen counters. Yet, as we sterilize our homes, we are unwittingly cultivating an entirely new playground for evolution. These changes are reshaping the organisms that live with us, Dunn explains, prompting some to become more dangerous, while undermining those species that keep more threatening organisms at bay.