Its about TIME

SO what, really, is time? It's not the units which we use to measure time, or even the arbitrary values we place on time for our selfish earthly needs - hours, days or seconds are all part of a nifty method we came up with to relate it to how long it takes for the earth to revolve about its axis.

It turns out that the definition that physicists are happy with is that time is a dimension. The Fourth dimension, in fact, following length, width, and height. We'll be using it in a lot of formulas, but first we'll be graphing it...

Of course there are other definitions of time...