We read that the Chaco Anasazi builders used “large timbers” 5 meters long, 22 centimeters in diameter, and weighing 275 kilograms. As anyone who splits his own firewood could tell you, something is amiss here. The Handbook of Chemistry and Physics tells us that ponderosa pine has a density of about 0.5 gram per cubic centimeter, so if you do the math, you come up with a weight of about 95 kg per log.
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