Recently, while tutoring a student, he told me that some notes I had made for him a month or two ago saved the day.
Some students were in some class, econ maybe, but, as usual in school right before finals, were studying for another final. Math, in this case.
They were all confused about some math concept. So Alec pulled out the notes, and enlightened everyone as to the truth.
Nice.
Optimal thought and optimal fitness through reason, logic, science, passion, and wisdom.