With respect to faster than light speed stuff, may I recommend this video by a former colleague of mine:
https://www.youtube.com/watch?v=l9aLyfFnfOU


On Sat, Jun 5, 2021 at 8:21 AM 'Glenn A. Walsh' via Dome-L <[log in to unmask]> wrote:
    Laser Pulses: Faster Than Speed-of-Light?

Many people have heard that Albert Einstein, in his Special Theory of Relativity, sets-up a “cosmic speed limit” which forbids anything from traveling faster than the speed-of-light. Well, scientists now claim that a laser pulse can move slower or faster than the speed-of-light, in special circumstances.

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