Editor’s note: This story discusses sensitive issues involving children, mental health, sexually explicit content and suicide that may be disturbing to some readers. If you or someone you know is having thoughts of suicide, please contact the Suicide & Crisis Lifeline at 988 or 1-800-273-TALK (8255).What began as a congressional hearing Thursday on excessive screen time among children and young adults took a darker turn, as experts warned lawmakers that AI bots can harm children’s mental health and foster unhealthy, or even sexually explicit, emotional relationships.Dr. Jenny Radesky, an a...

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