I don't know at what age I realized it -- nor what spurred or caused it -- but I suffer from the irrational fear of tight spaces. Claustrophobia. That is such a marvelous and terrible (19th century) word. It's made up from the Latin claustrum "a shut in place" and the Greek φόβος, phóbos, "fear". Wikipedia says one study estimates that "from 5–7% of the world population is affected by severe claustrophobia". I'm bad enough, but I hope I don't think I qualify as 'severe'. Ever wonder if you're claustrophobic? There are a couple of easy ways to find out. You'll know it rather quickly if you ever have to go through a MRI of your head, or have to lie flat (with your arms over your head) under a Gamma-ray Camera (by way of experiencing a Thallium Stress Test). Believe me on this... I've experienced both.This post has been moved and updated to my current blog, which can be found here.