De dolende polen van het aardmagnetisch veld
https://podcast.npo.nl/file/de-jortcast/142298/de-dolende-polen-van-het-aardmagnetisch-veld.mp3?awCollectionid=feed-113-de-jortcast&awEpisodeid=feed-113-de-jortcast_episode-142298-WO_AT_20348771
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