The home jungle: how to live happily with the 5,000 other species in your house

Biologist Rob Dunn is the David Attenborough of the domestic sphere, uncovering everything from microbes in the shower to spiders in the basement. He goes on safari in the satisfyingly dusty corners of one Copenhagen homeThe good news is that I will never be home alone again. The bad news - well, it's not in fact bad news, but it is slightly unsettling - is that I share my home with at least 5,000 other species: wasps, flies, spiders, silverfish and an exotic bunch of wild bacteria.All that information is apparently contained in a patch of grey dust I have just swabbed with my right index finger from a door frame in my living room. It's like a DNA test of my house, says Rob Dunn, a 43-year-old American biologist who has come to my house in Copenhagen to hunt microbial life. He carries no lab gear and his blue crewneck jumper and striped Oxford shirt are hardly the combat suit of an exterminator. But with every discovery we make, with every spider we find lurking in the corner or each swab of dust, he displays an almost childlike sense of excitement. He swears and smiles, even whoops with delight: "This dust sample contains bacteria, your body microbes, your wife's body microbes, your child's body microbes. If you smoke weed we would find marijuana DNA in there. Everything is visible, but it's also present in every breath. Every time you inhale, you inhale that story of your home." Continue reading...