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MEDIA ENCLOSURE: http://flex.acast.com/www.scientificamerican.com/podcast/podcast.mp3?fileId=3EFAEFA6-3B3B-47AB-9B70E11C63A47849
MEDIA ENCLOSURE: http://flex.acast.com/www.scientificamerican.com/podcast/podcast.mp3?fileId=A15C6812-8DDF-4A71-8698A17D206BBEFF