In the video, the guy stirs coffee with floating crumbs and notes the crumbs nearer the middle rotate at a different angular rate than crumbs further out. He then spins a compact disk (CD) and notes all the marks on it rotate at the same angular rate because they are embedded in the disk itself.
He says the stars in our galaxy rotate more like the marks on the CD, which leads scientists to postulate the existence of "dark matter", an invisible, undetectable substance that fills what appears to be empty space between the stars. Dark matter/energy constitutes the vast majority of the Universe.
According to http://en.wikipedia.org/wiki/Aether_(classical_element), "Albert Einstein, in an interpretation he offered for his theory of special relativity, dismissed [aether] ... though he later reinstated a logical need for an aether in a commentary on his theory of general relativity, modern astrophysical theories refer to this as Dark Energy/Matter."
I, like classical scientists, cannot fathom an "action at a distance" force field, such as gravity, without some physical matter filling the void between the masses that are attracted to each other by that force. Were classical scientists basically correct about aether and is the modern notion of dark matter/energy simply a refinement of that concept?