That left 300 million tweets, each of which was awarded a mood score based on the number of positive or negative words it contained. For example, "diamond", "love" and "paradise" indicate happiness, whereas "funeral", "rape" and "suicide" are negative. "Dentist" is fairly neutral.
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He points to research showing that old brains can grow new nerve connections, to surveys that indicate happiness peaking at 85, to all the creative potential he has witnessed in the elderly.
他指出研究显示老年人的脑袋也能生长出新的神经连接，而且调查显示幸福指数在八十五岁到达最高峰，他指出了他在老年人身上所看到的所有创造潜力。
The results indicate that gratitude reliably increases happiness.
结果显示心怀感激确实能增强幸福感。
A number of recent studies indicate that happiness is more easily attained after middle age.
最近的许多研究表明，人过中年，将会更容易获得幸福感。
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