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Use "worldline" in a sentence
"On the other hand, Dowe's answer is that the worldline of the moving shadow is the worldline of an object that does not possess charge, while the ˜worldline™ of the segments of shadowed plate segments is not the worldline of an object."
"Does a physical object of light (photon) GAIN a 'worldline' when it collapses, that it didn't have as wave?"
"And the question "Where was the 'worldline' before it became 'real' (space? time? spacetime?) and what does it include?" is no more meaningful then "Where was the sound before I clapped my hands?""