Astonishingly, in spite of decades of research, there is no agreed theory of cancer, no explanation for why, inside almost all healthy cells, there lurks a highly efficient cancer subroutine that can be activated by a variety of agents - radiation, chemicals, inflammation and infection.
Consider the momentous event in architecture when the wall parted and the column became.
I think I'm in better shape now than I was 10 years ago, but it takes a bigger toll - I get back pain!

