For Amanda

I'm posting this for Amanda who asked if I knew the difference between running and jogging. I looked it up, and there are a couple of ideas. Here's one. Here's another. It sounds like semantics to me, but the kinds of semantics that some people take very seriously. We've never had the caving/spelunking or boat/ship debates on this blog, but I assure you, there's a difference. Also, I'm posting this because it's seems relevant to the topic.