I have another post in the works but...

I learned this a few weeks ago in HLS as a kind of side-note, wrote it down, and forgot until I was redoing my little to-do list thingie that I keep:

It's known to many young people these days who have taken Calculus that the first derivative is called the slope of a function.
The 2nd: Curvature

Less commonly known is that the 3rd is called the skew.

And what I learned in class is that the 4th derivative is called (drum roll, please):
Kurtosis!

I kind of like that word, it's nifty.

"What they should be saying at these schools, rather than correcting technical flaws, is--do something with your spirit and your relationship to the universe."
-Lynne Sharon Schwartz