(April 7, 2017) A major new study published in Science claims that the reason why many people get cancer is simply just bad luck. It’s normal for people to seek a reason when someone develops cancer (did he smoke? Was it hereditary?), and certainly lifestyle factors can play a major role in the development of lots of cancers. This new study, however, conducted by researchers at Johns Hopkins University, uses mathematical modeling to suggest that random DNA copying errors are responsible for approximately 66% of cancer-causing mutations.