填空题 .It's plain common sense—the more happiness you feel, the less unhappiness you experience. It's plain     1    , but it's not true. Recent research reveals that     2    are not really flip sides of the same emotion. They are two     3    that, coexisting, rise and fall independently.
    "You'd think that the higher a person's level of unhappiness,     4    their level of happiness and vice versa," says Edward Diener, a university of Illinois     5    who has done much of the new work on     6    . But when Diener and other researchers measure people's average levels of happiness and unhappiness, they often find     7    between the two.
    The recognition that feelings of happiness and unhappiness can     8    much like love and hate in a close relationship may offer valuable clues on how to     9    . It suggests, for example, that changing or avoiding things that     10    may well make you less miserable but probably won't make you any happier. That advice     11    by an extraordinary series of studies which indicate that a genetic predisposition for unhappiness may     12    . On the other hand, researchers have found, happiness doesn't appear to be     13    . The capacity for joy is a talent you develop largely for yourself.
    Psychologists have     14    a working definition of the feeling—happiness is a sense of     15    . They've also begun to find out who's happy, who isn't, and why. To date, the research hasn't found     16    for a happy life, but it has discovered some of the     17    that seem to bring people closer to that most desired of feelings.
    In a number of studies of fraternal and     18    , researchers have examined the role     19    plays in happiness and unhappiness. The work suggests that although no one is really born to be happy,     20    may run in families.
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