What is time?
Is it an ever-rolling stream that bears all our dreams away, as the old hymn says?
Or is it a railroad track? Maybe it has loops and branched, so you can keep going forward and yet return to an earlier station on the line..
'Einstein's general relativity gives time a shape.
How this can be reconciled with quantum theory.'
.. 'The shape of Time' Chap 2. A Brief History of Time.. Stephen Hawking
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