Saying c as “the speed of light” is an easier thing to comprehend than c as “the speed of causality” which is really what it is. It so happens that photons trav

Saying c as “the speed of light” is an easier thing to comprehend than c as “the speed of causality” which is really what it is. It so happens that photons travel at the speed of causality so we can get away with saying the speed of light. I’ve always had a problem with the speed of light being the ultimate speed limit in the universe. I would think “who granted the photon this authority?”. It wasn’t until I watched a lot of pbs space time YouTube’s that I learned what people really meant was the speed of causality is the ultimate speed limit. That makes more sense to me.