In the mid-1990s, Dr Berk found that laughter increases the number of natural killer cells in cancer patients. Natural killer cells are the body's way of fighting tumours.

早在上世纪九十年代，伯克博士就发现笑会增加癌症病人天然杀伤细胞(也叫抗癌细胞)的数目，天然杀伤细胞是身体对抗肿瘤的办法。

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Laughter truly is one of the best medicines for fighting off the bad-weather blues, says Scott Bea, a psychologist at the Cleveland Clinic.

克利夫兰医疗中心的心理学家Scott Bea表示，欢笑的确是抵抗恶劣天气带来的坏心情的最佳良药。

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Some of the men showed up -- we put them in the second row. (Laughter.) But they're going to be fighting -- (applause) -- they're going to be part of this Council, and it's going to meet on a regular basis.

WHITEHOUSE: Creating the White House Council on Women & Girls

Now, let me tell you what change looks like -- because those fighting change are still out there, still making a lot of noise -- (laughter) -- about what this reform means.

WHITEHOUSE: The Promise of Health Care Reform