The first, perhaps the biggest is genetics. Some scientists say that some people are naturally happier than others. Besides, major life events as well as social and economic factors can also stand in the way of happiness, such as losing your job or a family member. Then, there is health affecting your happiness. So, is it possible that people can find lasting happiness with so many factors preventing them?

　　Positive psychologists(心理学家)believe it's possible for people to stay happy for long periods, although it cannot be lasting. Martin Seligman at University of Pennsylvania argues that day­to­day happiness comes from two things: pleasures and satisfactions. Pleasures are rich experiences that simply make us feel good things like eating cake or drinking wine. While pleasures can be quite satisfying, the enjoyment we get from them is short­lived.

　　Satisfactions are activities that we like to do and we give all we have to them. They are often challenging, and we have to draw_on personal skills and strengths to perform them. For some people, satisfactions come with work. Doctors, for example, often become so concentrated in an operation that hours pass without them noticing the time. For others, it may be hobbies like gardening, playing tennis or stamp collecting. These satisfactory activities affect the mood in a way that appears to be lasting.

　　Too often, people choose pleasures over satisfactions because they are easier and the effects are more immediate. Though pleasures may work for a while, there are bad effects. Pleasurable activities become less enjoyable if overused. Always choosing pleasures over satisfactions can also prevent people from developing their personal strengths, which, if they're not put to work, will die.

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