πίσω στο σχολείο, εκπαίδευση, μάθηση, γράφω άσκοπα, σχεδιασμένο στο χέρι, γραμμή τέχνης, μαυροπίνακας, 3d απεικόνιση, e mc2, η φυσικη, Albert Einstein
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