The "Should I Skip Class Today?" Calculator.

When you not only don't want to go to class, you don't even want to make a decision for yourself.

(Via Inside Higher Ed.)

As a teacher, I need to reverse-engineer my classroom policies. I can see students using this calculator would be encouraged to skip!

Hmm... I just tried to do that. It seems the only way I can change something to get a different result is to give pop quizzes. That would be bizarre in law school. But the equivalent — which is  not accounted for in the calculator — is to call on students randomly and have class participation be part of the grade.