所以，你不仅可以毫无愧疚地网搜萌宠图片，还可以观看猫狗蠢萌视频哦。欢笑可以降低血压、减轻疼痛，还可以让身体更精神百倍地对抗压力。

3. Biting Your Nails Boosts Immunity

咬指甲可以提高免疫力

Nibbling on your nails is considered a bad habit, but only because of social convention. Back before we had nail scissors, humans would likely have bitten their nails for two reasons. First, it keeps them from getting too sharp and from injuring us, and second, it exposes the immune system to bugs. Research consistently shows that small exposures to bugs will help boost immunity.

根据社会约定成俗的看法，咬指甲是个坏习惯。在指甲钳发明之前，人类咬指甲主要有两个原因：首先，这样可以防止指甲长得过于尖长而伤到自己；其次，这样会使病菌有机可乘进入免疫系统。而一直以来研究都表明，一定程度的病菌入侵反倒有助于提高免疫力。

If you’re not a nail-biter, rest assured, you don’t have to start. Follow the principle that small amounts of exposure to bacteria are health-boosting, so don’t sterilize, scrub or scour your body too much.

如果你不喜欢咬指甲，当然最好还是不要养成这个习惯。请记住：少量细菌其实是有益于健康的，所以不要过分清洁自己的身体。

4. A Good Gossip Boosts Your Mood

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