DO THIS AND YOUR LIFE WILL BE MUCH HAPPIER! Having worked in the medical field for a long time and met many people, coming from many different families, living environments, and falling into many different situations, I wonder why some people can always be happy, while others are sad and gloomy. I once talked to a patient who was over 80 years old, had just been diagnosed with lung cancer and was undergoing treatment. Every week I have to have the fluid drained from my lungs. I asked recently...