Did you know that light-hearted people get hired more often than serious people? Single people often list "good sense of humor" as a top quality they look for in a mate. Is a playful spirit something you are born with or can learn? All people, no matter what their background or personality, can learn to have more joy in life. Most people are born with the ability to laugh and see humor. Some people just choose to develop it more. Lightening up your...