The Mourning of Lost Ideas

I have four piles of index cards in front of me.

One is labeled 'Expired or Irrelevant.'
Another is 'Too Vague" (or, 'What the Hell Was I Talking About?")
Smaller than the previous two is "Maybe."
By far the tiniest pile, containing only three cards of the thirty, is labeled 'Used.'

Here I am proving in practice the myth that the average human being only uses about 10% of his/her brain.