Wow. Constantino Tsallis: Describing a New Entropy [via MeFi]: The physicist has reformulated Boltzmann-Gibbs entropy in a way that allows low-probability events to "grow up" and become macroscopic (I'd always thought it a weakness of classical science that phenonemon cannot cross "levels"). Keep going with the article, it starts slow but about halfway down starts getting into the real meaning. God knows whether it's true or not though.
But the article does include the coolest phrase: "In fact, we are the offspring of those who quickly saw a tiger nearby, because it should not be there, and ran away."