Interesting

At around 5th grade, most semi-intelligent kids can figure out this logic puzzle. 

But, the interesting find: if the 5th grader gets it wrong, the adult version of this (let's call them not semi-intelligent) still does not get it right. Some people are not capable of 2nd or 3rd level logic and never will be. Which is why we have lots of folks who would benefit from getting vaccinated, not getting vaccinated. And income inequality, btw.