Didn’t know this was a thing. I arrived at the idea independently after noticing big airliners on landing approach look like they’re moving very slowly, but are actually moving at 150+ mph. The body-length speed explains it. We’re biomprphically wired to process speeds that way.
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Speeds expressed in body lengths per second give surprising results. A cheetah runs at 16 body lengths per second. Macropalpis mite achieves a top speed = 322 body lengths/s. The equivalent speed for a human running as fast as this mite would be 1,300 mph bit.ly/2FD02bu
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