Wasn’t measles eradicated in the United States years ago? Well, it’s baaack! But how? Hank Green says the disease has been back for about two months and the Center for Disease Controls says it could gain a foothold unless we get vaccinated. The current strain, Green says, comes from the Phillipines and might well threaten an endemic in our country. Tune in to this edition of SciShow as Green explains the unlikely comeback of the disease.