One-Twelfth of a Teaspoon

Ryan, a first grade teacher who blogs at I Thought a Think, shared a “motivational tidbit” he encountered in a commercial:

[B]ees make one-twelfth of a teaspoon of honey in their lifetime. That’s a lot of work for not much results, but the cumulative effect of all those bees making honey is a neat thing.

How much of a difference does a single lesson make? A single unit? A single teacher? The answer is a crucial portion of the whole.