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为什么掰手指会“咔咔”响？到底能不能掰？
source link: http://tech.sina.com.cn/d/v/2018-05-04/doc-ifzfkmth8656488.shtml
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生活中，很多人动不动就喜欢把手指掰得“咔咔”响，尤其是小学生和中学生。在别人的面前把手指头弄出“咔咔”的响声，觉得很酸爽，认为这既是一种技能，还能炫耀。但是，你有没有想过掰手指为什么会发出“咔咔”的声音呢？让人酸爽的掰手指会带来哪些危害呢？
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