. >>> professor carol secora is a cancer specialist and he told me about how this study worked. >> what they calculate with the number of times they divide over a life span, and showed that the risk of getting cancer about 2/3 of the time was due to random mutations at the point of division. and normally when cells divide if there's a mutation the cell doesn't survive, or you never know it's happened and a cleaning up process is in place. but now and again, you get cancer. the study clearly shows about 2/3 of cancer are due to random mutation. we can do nothing about it. whereas a third are due to factors that we do have control. so the best analogy is driving a car along a busy road. if you drive carefully, you're less likely to have an accident. but if it's snowing and icy, it's an accidental factor you have no criminal on. >> this is a bit like saying every now and again a thunder bolt will hit your car and there's nothing you can do about it. >> absolutely. life is a dangerous disease to be alive. there's only one outcome at the end for us all. and we forget that. >> isn't it the ca