费恩曼物理学讲义 : 新千年版 = The Feynman lectures on physics / 第3卷 Volume III.Fei en man wu li xue jiang yi : Xin qian nian ban = The Feynman lectures on physics / Di 3 juan Volume III.

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Laugh and cry. Having a good sob is reputed to be good for you. So is laughter, which has been shown to help heal bodies, as well as broken hearts. Studies in Japan indicate that laughter boosts the immune system and helps the body shake off allergic reactions.
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