λάμπα, ιδέα, αυτοαπασχολούμενος, επίπτωση, διαφώτιση, δημιουργικότητα, πρίζα, φως, ενεργειακή επανάσταση, ενέργεια, ηλεκτρική ενέργεια
Public Domain
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