Time
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Time or time-like structure is the most mysterious concept that is also most commonly experience in everyday life. In [[Lee Smolin]'s book on Trouble with Physics, he questioned that whether the language we used to describe the spacetime universe is adequate for solving this mystery.
Time-like structure is based on the idea of world-line or causal cone. A good introduction on this concept can be found on Eigenchris[1] and PBS Space Time[2]:
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