Two large Apple shareholders are questioning the smartphone maker, saying it needs to respond to what’s seen as a “growing public health crisis” of smartphone addiction in young people, reports The Wall Street Journal. Activist investors Jana Partners and the California State Teachers’ Retirement System (Calstrs) pension fund own $2 billion worth of Apple shares. They wrote a letter to Apple asking it to help parents limit phone use through developing new software tools, and to also investigate the impact of using phones too much on mental health.

The letter cites studies that show American teenagers receive their first smartphones at the age of 10, and spend an average of 4.5 hours a day on it (excluding texting and talking times). It…

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