What is it? Where is it? When is it? (Shareware)

Until his relativistic views emerged as the new physics of the 20th century and beyond, scientists, thinkers and science fiction writers let the human imagination run wild with the most elusive phenomena in the universe – time. But what is it? Where is it? When is it?

The space-time continuum described by Einstein is four dimensional.

The three dimensions of space include width, breadth and depth, which can all be measured. The fourth dimension is time, which we cannot see or touch. Time is experienced.

Read complete article here. {via Science Alert}