Today we launch a four-part series of podcasts on stem cell technologies around the globe. Stem cells have been heralded as possible cures for diseases such as Parkinson's and diabetes. But their use raises serious ethical questions, especially here in the United States. Over the next four days, we'll explore the science and politics of stem cells here in America, and also in Britain, Israel and China. Be sure to check in over the next four days.

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