National Geographic released a fascinating article today, entitled: "Dark Matter Is an Illusion, New Antigravity Theory Says."
From what I understand, everything that dark matter has been used to explain can be explained by weird gravity dipoles. Although this is a somewhat controversial idea, I think it's an attractive one, so I hope to hear more about it as it's refined and tested.
When I tell people that gravity and evolution are both scientific theories, they often scoff. With both gravity and evolution, we know the general picture, especially as it affects us. Scientific debate and deliberation is concentrated on the details and how they make up the general picture. Contradicting the mountains of evidence supporting either is likely impossible.