I got up at 4:30 am this morning to work some AP Physics problems in electrical potential. I have never been a big fan of E&M, but the second semester of AP physics is all E&M. So, I have to study and work problems. I have a student at noon that is taking AP physics. Anyway, as I was sitting there working a problem I remembered that Carl made mention of the number of calculators appearing in a picture. So, I decided to see how many were on the shelf where I keep my books. There were eight, six electronic and two slip sticks. I have a lot of fun with the students when I ask them if they would like to see the calculator I used in high school and pull out a slide rule. They think I am joking and then I challenge them to a calculating contest. As long as you keep it to three significant figures, I can hold my own against them and their calculators.

Well, my mind continued to drift and for some reason I remembered a cheer we had at MIT where I did my bachelor's and PhD. You have to be a real geek to appreciate the humor.

e to the x dy/dx
e to the x dx
cosine secant tangent sine
3.14159
cube root, square root QED
slide rule slip stick MIT

And with that I will get back to calculating electrical potentials of discrete charges.