Eat Dirt

All we need to do to load up on our old friends and get more of these microexposures is easy, fun stuff we probably already love to do: Get back to eating seasonally and locally. Spend more time outdoors. Hug our dogs after they roll around in the leaves. Let our kids make mud pies and get their hands dirty on the playground.

On a cell-for-cell basis, we are 90 percent microbial. We don’t just live on the earth—the earth lives in us.