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.
A number by itself is useful, but it is far more useful to know how accurate or certain that number is.