'Yawn cams' and heart monitors: five key facts about the world's longest sea bridge

'Yawn cams' and heart monitors: five key facts about the world's longest sea bridge  The Guardian World's longest sea crossing: Hong Kong-Zhuhai bridge opens  BBC News China's president launches Hong Kong-mainland mega bridge  The Star Online China's president opens long-delayed southern sea bridge  Aljazeera.com China is opening the world's longest sea bridge  QuartzFull coverage

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