Autor: Daniel Schwen http://www.wiadomosci24.pl/artykul/25_procent_hiszpanow_wierzy_ze_slonce_krazy_wokol_ziemi_331387.html Mat. ilustr. http://www.patheos.com/blogs/asenseofplace/2013/08/starting-from-ignorance/ [CC-BY-SA-2.5 (http://creativecommons.org/licenses/by-sa/2.5)], via Wikimedia Commons Licencja: CC4.0
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