Will it rain or not? How you interpret the forecast could mean the difference between getting soaked or staying safe. Maria Pavlova/iStockphoto hide caption

itoggle caption Maria Pavlova/iStockphoto

Brian Zikmund-Fisher with his wife, Naomi, and daughter, Eve, in 1999, after he had a bone marrow transplant. He says he made the decision to have the treatment based on factors he couldn't quantify. Courtesy of Brian Zikmund-Fisher hide caption

itoggle caption Courtesy of Brian Zikmund-Fisher