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Continue to ChatSmartphones: used in mini bursts, five hours a day https://betterblokes.org.nz/2015/11/smartphones-used-in-mini-bursts-five-hours-a-day/
Smartphones: used in mini bursts, five hours a day https://betterblokes.org.nz/2015/11/smartphones-used-in-mini-bursts-five-hours-a-day/