Web sites being nice

Was just over at Khan Academy seeing if that guy had done explications of some finance topics I'm currently grinding into my wee brain.  He has not.

But on the way in it half forced me to do a diagnostic test of my math skills, and then offers little tutorials/mini-quizzes to help freshen those skills up.  I could not resist.  Why am I such a sucker for being measured by computers?  It is my perverse, nerd idea of fun.

It will, in fact, also help me be able to help the kids with math homework, which is a fine thing.