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Today, nearly all U.S. teens have a smartphone. MoMo Productions/Digital Vision via Getty Images Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to curiouskidsus@theconversation.com. How many hours does the average American spend on devices each year? – Maxwell P., age 10 Think about your favorite devices – your smartphone, laptop, tablet, computer or console – the things you use to play cool games, watch hilarious videos and conn