A point of interest too, and something I learnt today... how skin cancer is actually formed
Everyone knows that the basic "control" inside the cell is performed by a combination of A, T, and G (ie DNA). A bonds to T, G bonds to C and vice versa. Well it seems that when UV strikes a cell, it causes "T" to "stick", that is, T bonds to T. When the strands separate to replicate, that causes mutations, and if these mutations are in the portion of the cell that corresponds to cell growth, then you get cancer.
So simple
Cheers,
Brad