Ιστορικό, εκπαίδευση, γράφω άσκοπα, ταπετσαρία, επιστήμη, εξίσωση, η γνώση, Επιστημονικός εξοπλισμός, εργαστήριο, πείραμα, πληροφορίες
Public Domain
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