[MHGinTN]

"... no one has ever found more than one dimension in time and three in space." Now, if they would change the wording to read '... no one has ever found more than one variable of dimension time and three variables of dimension space.' This might make more sense. After all, there existed a present that we passed through to reach the present we inhabit and we are moving through time toward the future we have yet to reach. [Actually, we do not sense the present directly, we only infer it from the collected data of past events that impact our senses on a delay ranging from millions of light years to moments.]

[RightWhale]

If the dimensions are generalized there may prove to be fewer than these. Then we are dealing with Hamiltonian mechanics rather than Newtonian mechanics, a better situation altogether.