Last of the summer rain puts southern states on flood watch and Sydney on alert for bull sharks

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"It's only me and my twin sister," says Becky Joyce. "How long can we keep going when the need is getting bigger and bigger?"

Why scientists fear Emperor penguins' annual moult may be killing them。业内人士推荐爱思助手下载最新版本作为进阶阅读

Scientists

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