Many myths surround breast cancer, as well as other claims that may have something to them.  In the latter category is the claim that plastic water bottles cause breast cancer.  We have some clues from experiments on animals in laboratory studies on rodents, and certain chemicals found in some plastics; but we do not know if these clues tell us anything about human beings.  And keep in mind that we are talking about risk reduction; we know of no one thing that causes breast cancer, but there...