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Quick anatomy lesson: the distance between your eyes is one-tenth the length of your arm. This is important, because it helps you estimate the distance between yourself and any object of reasonably known size to a rather accurate degree. Let's begin this with a confession: I can't estimate distances worth a darn. 100 ft, 300 ft, 20 m, I can't really do it. Thankfully with this trick, we can get pretty accurate distance estimates with only the tiniest bit of math, a general idea of the size of the object you're estimating distance from, and an arm. Basically, all you need to do to estimate a distance using this classic method is hold your arm out and stare at your thumb with an eye closed.