For education and discussion only. Not for commercial use. LONDON (Reuters) - If you're happy and you know it then it's clearly a result of: P + 5E + 3H. A pair of British researchers said Monday they had worked out a simple equation to quantify happiness that could put an exact figure on the emotional state. After interviewing 1000 people, the researchers -- a psychologist and a self-styled "life coach" -- concluded that happiness equals P + 5E + 3H. In the equation, P stands for Personal Characteristics (outlook on life, adaptability and resilience); E for Existence (health, friendships...