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The stethoscope seems so simple — a 19th century tool for listening more closely to the human heart or lungs. It also sparked a culture of listening that is transforming the way scientists learn.

Mediums say they can tap into the spirits of famous artists and authors to create new works. In other countries, it might be called fraud. In Brazil, it's considered a form of religious worship.

Ten years after the storm some residents have found healing — in the arts, family and new opportunities. Others suffer lingering grief and other difficulties they trace to Katrina.