In a new study of more than 50,000 Korean adolescents, those who used a smartphone for more than 4 hours per day had higher rates of adverse mental health and substance use. In a new study of more ...

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Some people won't mind if you keep your screen visible, but that doesn't mean you should let yourself be distracted. Jason Chun is a CNET writer covering a range of topics in tech, home, wellness, ...