From Jacob Silver:

Re: Where's the dark matter? Not here, befuddled astronomers find (April 18): It was a desperation move on the part of physics theoreticians to conjure dark matter, despite there not being any direct evidence of its existence. The standard model has served us well, and may still be valid. But we now need someone to think outside the box to explain both the expansion of the universe and the rapid rotation of galaxies. The standard model alone does not explain these, that is why they threw in dark matter. But some conceptualization, perhaps involving the basic configuration of the universe, or perhaps a reconception of gravity. Someone has to free themselves of the current theory and think outside the box.

Jacob Silver, Ph.D.