First, a message to all of you who are Fathers and have Fathers and Husbands: Happy Father's Day. Enjoy the day with friends and family. Meanwhile, the discussion over stem cells continues.

Even if stem cell research could lead to a treatment for Alzheimer's disease, its supporters face a number of political hurdles. Some of the most promising stem cells -- cells that can "learn" to become any type of cell in the human body -- come from human embryos. In this audio story, NPR analyzes the issue which can lead to strong discussion and debate, depending on one's convictions.

This file is in Real Audio or Windows Media. You probably have both on your computer, pick an option and listen to the story.

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