但实际上，那些“咔咔”地掰指关节的人比其他人拥有更健康的关节。
But people who can crack their knuckles may actually have healthier joints than others.
先前的研究显示，25%到54%的人掰指关节，掰指关节的男性比女性多。
Previous studies have shown that between 25 and 54 per cent of us crack our knuckles - with men doing it more than women.
为什么会出现这道白光，以及为什么掰指关节会发出这么大的声音，还有待进一步研究。
Further research is needed into this streak of light - and why the cracking sound is so loud.
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