The main takeaway for me is that of a deeper "that's the way it is": * My understanding before: light has a constant speed and nothing can exceed that speed, b

The main takeaway for me is that of a deeper "that's the way it is": * My understanding before: light has a constant speed and nothing can exceed that speed, but up until that limit everything can travel at a variety of speeds. * My understanding after: everything travels through space-time at a constant speed. Light is "special" only in that it travels exclusively through space and not at all through time.