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How can the four-speed of all material particles be the speed of light even though they...

How can the four-speed of all material particles be the speed of light even though they clearly zip around at various slower speeds? If the universe is 13.8 billion years old, how long is the world line of every material particle in the universe?

please show all the work and steps, because similar problem will be on my next exam. I want to learn it please.
thank you.

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