Well, okay, I do have one and I try and keep it challenged. We should be doing the same things for the brains of our students. It's Brain Awareness Week and the folks at eSchoolNews had an interesting (and brief, so take a minute to read it!) article with some facts about the brain. Within the article there are related links that might be of interest.
Earlier this week I was in Columbia, SC speaking at a PK/K conference put on by my friends at SDE and I was sharing a few brain tid bits that hit home for those eductors: when students use both hands to learn or practice a skill or concept, they are more likely to remember it (so pipe cleaners are better than paper and pencil for kids trying to remember letter forms) and ball tossing boosts thinking (write math facts, vocab words...on beach balls and toss those around, asking students to identify, read, complete, or answer the item their right thumb lands on). The latter tip came from Eric Jensen and his book Brain Compatible Strategies - worth a read.
Take care of your brain and your brain will take care of you.