The sun is a cause of cancer, but not the only or even a primary cause. The real "cause" of cancer is cell mutation, which can be triggered by sun, chemical exp

The sun is a cause of cancer, but not the only or even a primary cause. The real "cause" of cancer is cell mutation, which can be triggered by sun, chemical exposure, or simply sheer random chance -- part of the thesis of this article is that, since whales have so many more cells, the "random chance" type would be more likely to happen. And one tumor is enough to kill us, so why not whales? That's the question they're asking.