What is LIFE? Life not just like a word have many definitions.As people always say that ''it is a mystery,Its about being yourself someone only you can be,some also said that it is only traveled once.Life like music,it must be composed by ear,feeling and instinct not by rule. Life is Risky. But not very that, For people in our society ,the probability of any unexpected death to them or their loved ones is tiny,but not zero. Mathematical thinking is essential for getting risks i