Quote Originally Posted by OLD_SCHOOL View Post
Well this is a complete left field guess, but again with my temperature analogy. There is a point I think in the negatives, where Fahrenheit and Celsius are the same. I will also point out that this is from high school memory, which is not exactly fresh anymore so I could be mistaken.
Not that it matters a whit for grits, but yes, the two scales are coincident at one point. That is, minus 40F equals minus 40C.