[jeff303]

Yep, it's the most insanely underappreciated public health intervention in history.

[thinkcontext]

Many public health people say that iodized salt takes those laurels. Or maybe its the most bang for the buck, at an estimated $.05/person/year to prevent intellectual and developmental problems. Guess it depends on exactly what you mean.

https://en.wikipedia.org/wiki/Iodised_salt