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"Also, can you tell me how you checked tags?" From the podcast tab of the Frontiers show, clicked the Subscribe button and selected RSS, then selected View > Developer > View Source in my browser. I cleaned up the source XML using a text editor (Atom) and then counted the number of <item> tags.
"What can I do for other podcasts like the Nature podcast?" I couldn't find an RSS/podcast link on the show's page or on iTunes. It appears that this show (last broadcast in 2014?) isn't available as a podcast.