Merging space and time to-gether into space-time was a good idea. And
merging space-time into time is my dangerous idea! Space and time,
space-time, and now time, is my brief history of time in one sentence.
Time is the eternal fabric of the universe, parallel universes,
multiverse, hell, and the Heaven. There is a raging debate going on
about whether the fourth dimension is time, or whether it is a 4th
spatial dimension. The unification of time and space as a
four-dimensional continuum (spacetime) and the concept of a fourth