Chemicals from our phone and TV screens are accumulating in the brains of endangered dolphins and porpoises. New research shows these "liquid crystal monomers" from e-waste can cross the blood-brain barrier and may disrupt DNA repair, highlighting the growing impact of electronics on marine life.

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Rebecca Morelle,Science Editorand

这叫“变工”，讲究人多力量大，也是一种在乡村社会里衍生出的互助生存模式。秋收后碾麦子和胡麻，逢年过节杀羊杀猪，还有红白喜事彼此帮忙办席。这样一来，不仅效率高，还有热火朝天的热闹气氛。

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