Eat less chewing gum.

少吃口香糖。

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According to a recent online survey by Extrawhite, a maker of chewing gum, a quarter of the people in China never smile or smile less than five times a day.

益达口香糖公司近日开展的一项在线调查显示，四分之一的中国人从不微笑，或每天微笑不到5次。

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Now researchers say they have an answer — chewing gum after hearing a catchy song will help you think about it less often.

如今研究人员宣称他们找到了答案——听完口水歌后嚼一嚼口香糖，你就不会那么频繁地想起这首歌。

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And this is really significant because if we were a great ape, we would spend about six hours a day just chewing our food, and as it is, we spend, all humans, less than an hour a day.

NPR: Scientist: Cooking Sets Us Apart From Apes