Pay attention to the last 90 seconds... "trust us, we know"... 85% is history of past experiments, but...
Light MIGHT travel in one direction FASTER than in the other direction... "It's just an agreed upon convention. It is NOT an empirically defined FACT"
@ 5:30... "In the 1970's..." who? No one knows?!? and in the "1983 the meter was REDEFINED so that the speed of light could be a whole number..."
@ 9:55 mark "You might at this point ask, why those values... well, NO ONE KNOWS WHY"
" Improved experimental techniques that, prior to 1983, would have measured the speed of light no longer affect the known value of the speed of light..."
"Depends on two constants... there is no theory where they come from" => @ 3:47 Imagine if this WERE NOT THE CASE, and information could flow INSTANTANEOUSLY from one part of the universe to another"...
No TIME... "we would have to throw out everything we have learned over the last 100 yrs in modern physics"
Which it DOES... in Quantum Entanglements
@ 26:20 "these experiments were done in the 1970'S, and again with more precision in the 1980's, and countless times since"... no mention of by whom/when?