If the universe is a non-spatial computer, a ‘time machine' is a program that allows a user to have the same (ontologically non-spatial) feelings or experiences that occurred or s/he merely feels to have occurred in the past, with an in-built function to have different feelings or experiences than those of the past, and thus creating a possibility to change the past or to rewrite history in a pseudo sense.
One of the great intellectual mistakes Einstein made is that he thought that space and time are physically or ontologically entangled. In the present non-spatial universal computational program, space and time happen to be entangled to the extent that, under certain unique circumstances, changes in spatial measurements indicate changes in temporal ones. However, a change in the program itself may cause space and time to disentangle.
I am convinced that an electronic machine, no matter how smart and intelligent, being still a mere spatial structure in concept, can neither innovate nor even understand the self-evident proposition: ‘No spatial structure can be a representation of any feeling'. Such innovation can only be a work of a non-spatial mind, like a human being, and only such innovation, it should be acknowledged, can pave the way for further scientific achievements.
In the midst of excitement, grief, joy, and solitude, I remind myself every moment that the sole mission of my life is to find "the ultimate questioner" - that unimaginable who has put me in this madness to answer an unanswerable question.