I told him he would break his arm if he did that. But he did it anyway. iStockphoto.com hide caption

itoggle caption iStockphoto.com

Whether or not you'll someday get cancer or any disease can feel like a roll of hundreds of dice. Calculating the odds --€” and knowing what they mean --€” is tricky. Katie Harbath/Flickr hide caption

itoggle caption Katie Harbath/Flickr