From "good dirt" to nutrition, we talked to parents and experts about the building blocks of a super-powered immune system. Every parent knows a familiar cycle: summer freedom gives way to September ...

As a child, you may have been told that playing outside in the dirt is good for you because it strengthens your immune system. But is there any evidence to back this claim? In short, yes — several ...

Your 99.9% germ-free habits may be hurting long-term immunity. Here is what the hygiene hypothesis says about how these ...