It's OK if they eat dirt

The New York Times offers advice you don't often hear.
We're too clean.
“Our immune system needs a job,” Dr. Lemon said. “We evolved over millions of years to have our immune systems under constant assault. Now they don’t have anything to do.”
She isn’t alone. Leading physicians and immunologists are reconsidering the antiseptic, at times hysterical, ways in which we interact with our environment.
It's spring. Time to get dirty.