Survival rates for many types of childhood cancers have reached 80%—a huge increase from a few decades ago. But there’s still more to do to ensure the treatments used to treat kids don’t harm them down the road.

Asthma is a big problem in Canada—and it’s only getting worse. Dr. Stuart Turvey believes the culprit could be that our kids are too clean. Specifically, his research pinned down four kinds of bacteria that could help prevent the debilitating disease in kids.