I have issue with describing the speed of sound or light as human scale. The simplicity of remembering 1 foot is utterly drowned out by trying to appreciate wh

I have issue with describing the speed of sound or light as human scale. The simplicity of remembering 1 foot is utterly drowned out by trying to appreciate what a nano second is. As a factoid it's easier to remember yes. But a factoid in isolation is useless. So unless you're going to do E=MC2 in imperial