I always heard “another thing coming” until sometime in, say, the last twenty years. I took “another think coming” to be a variant people employed to be funny. Since I am not much younger than Rand Simberg, it may have once been a regionalism to use think rather than thing, so we learned it differently when young. It’s unfortunate that noting the difference was lent emotional attachment by deploying it as Sarah-bashing, thinking she’s stupid for using the more common version of a phrase.
On the plus side, from the comment thread I learned that “another think coming” was the original, largely replaced by morphing of the language.
Who aved the most lives in history? Fascinating list. I tend to think of Borlaug as the biggie, credited with saving perhaps billions, but he is in sixth. Of course, numbers like these are always going to be estimated and conjectured. Still, these are some impressive people. Big Damn Heroes, in fact.