Very good, clear and concise.

Amazing explanation!!! Thank you so much.

I found the commentary on this video rather confusing - the description seemed to wander between "R = c x t" as being defined as the radius, diameter and circumference of a circle. In the illustration the larger circle was stated as having a circumference of 1/R and also being greater than R itself of the smaller circle - the winding path was an additional layer of confusion! I understood string theory to be counter-intuitive and decidedly strange, but this level of weirdness is difficult to accept.

Ed Lukowich - Author of Trillion Theory - www.trillionist.com This guy talks of... unwinding... and 16 & 20 billion year old stars. But if string theory is obsolete by the conforming of black hole rims, all of it it science to move on from. I`ll be wrong. Thank you for the lectures Prof.!

Is length contraction from Einstein's Relativity also a sample of how space is not an invariant?