Not sure what you're measuring with 3m/10ft, and what would travel that distance at the exact speed of light. For the reference, electrical signals travel at ab

Not sure what you're measuring with 3m/10ft, and what would travel that distance at the exact speed of light. For the reference, electrical signals travel at about 2/3c through fiber, a bit faster that that through copper. I was simply pointing out that even interaction of atoms to proximity is propagated with a speed of light, and should not be called zero. Nothing to do with the rest of the article or the excellent app idea.