HMS professor of neurobiology Margaret Livingstone uses art to understand how we perceive and process visual stimuli, and HMS professor of pediatrics Charles Nelson employs noninvasive techniques to measure the brain activity of children while they look at faces. Plus, you’re more microbe than mammal—at least according to your latest cell count. For supplemental information, listen to an extended interview with Margaret Livingstone as well as an extended interview with Charles Nelson.

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