Have smartphones really destroyed a generation? We don’t know.

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• The variable

• Are teens who are more depressed spending more time on their phones? Or are teens becoming depressed because they spend more time on their phones?

• nutrition research, another famously messy field of scienc

• much so that memory-based diet research may be “fundamentally and fatally flawed,”

• Sometimes the question is refined to “how many hours a day do you spend on social media?” Or “how many hours a day do you spend playing video games?

• found only about a third of people are accurate self-reporters.