人体十大未解之谜:为何尴尬时会脸红?(图)(9)
2009-08-10 09:07:04
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为什么要挖鼻孔?
9.挖鼻孔:挖鼻孔这种讨厌却又无可避免的习惯,四分之一青少年每天平均进行4次。科学家亦曾试图研究它的目的何在,却徒劳无功;退一步说,即使鼻屎和鼻涕能吃得下去,但也没有营养可言。有解释认为,挖鼻孔会强化免疫系统。
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