Subject: Wacky World of Lightspeed
I thought this was interesting.....

https://bigthink.com/hard-scie...

At light speed, Einstein's equations break down and nothing makes sense
Everything everywhere all at once.

The relationship of light to time is nonintuitive. Mathematical limits allow us to figure out what happens to photons at the exact speed of light where Einstein's equations break down. At the speed of light, clocks stop ' and the Universe is shrunk to zero size.

... more at link