What countries do they come from and what are Rankine, Delisle, Reaumur and Romer? I know of the rest... they are used in chemistry...
Math Is Fun Rocks!
By the power of the exponent, I square and cube you!
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.