I have read an amount of material on (potential) variations in the Fine Structure Constant. The majority of the material seems cautiously positive in declaring support for the potential variations, but I have a couple of question that you may be able to help me with. 1) Am I correct is believing that the possibility of variation in the constant over the evolution of the universe is generally supported? If anyone can point me at articles that look unfavourably at this possibility, I would appreciate it so that I can have a balanced view (I think that everything that I have read is broadly supportive). 2) From what I understand, the primary evidence is based on the absorption lines associated with Magnesium (and associated isotopes). Why was / is Magnesium the element used? Thanks for all you help. Regards, Noel.