Kids don't need to get sick to be healthy

We have forgotten how many children used to die before their fifth birthday

In response to rising measles cases this year, some are claiming that measles is actually good for children—that fighting off the infection will make them stronger. 

These rumors are catalyzed by the overall sentiment that children in our modern era are less healthy than they used to be. While there are some types of disease where this is true—metabolic …