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Continue to ChatIn Sachen "Baustoff der Welt" https://kosmos-mensch-und-erde.ulifischer.de/blog/2016/12/20/experimente-in-sachen-baustoff-der-welt/
In Sachen "Baustoff der Welt" https://kosmos-mensch-und-erde.ulifischer.de/blog/2016/12/20/experimente-in-sachen-baustoff-der-welt/