I salute Tom Hale. Anyone who can patiently teach us the ins and outs of miniscule particles, and get us to think we're having great fun in the process -- even if our neck hair stands on end at the thought of deep mysteries in the chemical world -- deserves a fine reward. Seriously, we sure appreciate your help in making the perplexing issues much more understandable. Even though I'm extremely right-brained, I don't dare scroll past those didactic postings for fear of missing out on a lesson such as the one on compartments. Pharmacokinetics: If you can say it, you can begin to grasp it! Kathryn Colestock-Burke, CNM Fall is arriving in southern MN