Non-math person here. Was hoping for more talk on dimensions above three. I believe in string theory the extra dimensions are "compactified" -- too tiny for us to detect? And that most of the gravitational force, which is inexplicably weak in our 3D, lives there? What about the extra dimensions used by -- is it electrical engineers? -- to solve real-world problems -- these would seem to be entirely different conceptually from compactified extra dims? And if there is a 4D (5D, 6D ...) world of which our 3D world is but a subset, would that be yet another incongruous definition of extra dimension(s)? If we cannot perceive such a higher dimension directly, then can we infer it from effects on our world that could not be explained otherwise?,(reply>), Thanks for watching and commenting, for more tutorials on cryptocurrency, make a note to my analyst and market guru for help on how to break the bank through cryptocurrency.<br>W•H•A•T•S•A•A•P or T•E•X••T<br>+1•4•4•3•3•9•9•6•2•6•2