Chad has another question: “Brolympus, I attended a running race over the weekend and saw that many of the vehicles there had stickers on them. The stickers had numbers on them, such as 13.1, 10k, and 140.6, for example. Can you tell me what these indicate and is there a hierarchy to them?”

That’s an easy one! This is how serious runners respond to the question “How long is your marathon?” So in your example, one person ran a 13.1-mile marathon, another did a 10K marathon (though we’re uncertain exactly how long that is since it is metric), and the last person did a 140.6-mile marathon. If you run 140.6 miles, that makes you an “Ironman.” But you’re also probably dead because no one can actually run that far. Hope this helps!