The scientific studies of twins and adoptees have shown that 50 percent of each person's happiness is determined from birth [past samskaras]. Only 10 percent is explained by circumstances [imposed samskaras] and rest 40% is "intentional activity," [free will] mental and behavioral strategies to counteract adaptation's downward pull. Psychologists have long known that different people can see and think about the same events in different ways, but they had done little research on how these interpretations affect well-being. [Scientific American, April 2007 page 23].

Three promising strategies supposed to be closely associated with happiness are: kindness, gratitude and optimism. Marina Krakovsky reports that what may be important is "habitual effort" and not mere one-time intervention. Happiness is not something fixed. Like a drug, diet or an exercise , happiness-interventions require sustained effort. "A lot of people don't apply the notion of effort to their emotional lives," Lyubomirsky declares,"but the effort it takes is enormous." The science of bio-psychology shows that happiness is the product of controlling all innate vrittis and there is no short-cut to lasting happiness without this massive endeavour. This is where Yoga comes in. Yoga life style aims to control our inner propensities and contributes to ensuring greater lasting happiness. One potential study may be: Are long-time yogiis proven to be more happier ? or What can make yogiis and non-yogiis equally happier ?