In part three: host Manoush Zomorodi explores how our tech habits are causing our eyes to change shape—to elongate—which causes nearsightedness. She investigates why rates of myopia among kids are soaring. She speaks with Maria Liu, an optometrist with a quest to slow down the progression of myopia in children by opening the first ever myopia control clinic in the United States.

Later in the episode, we hear from a team of employees who tried incorporating "movement snacks" into their days for one week.

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Are you signed up for Columbia's study, or following along with the series? We want to hear your thoughts! Send us a voice memo at bodyelectric@npr.org. Talk to us on Instagram @ManoushZ, and on Facebook @tedradiohour.