Teenagers today face an expanding and unpredictable role of Artificial Intelligence (AI) in society, yet educational interventions are still catching up. AI literacy is crucial for teenagers (and others) to help them make informed decisions about their futures. We present our work on Artificial Intelligence / Machine Learning (AI/ML) literacy with 43 Japanese and 20 Finnish high school students, exploring their pre-existing perceptions of AI/ML and how those perceptions evolved after they trained image classification models. Our findings indicate that while a substantial number of teenagers still have limited or contradictory understanding of the topic, even short-term workshops can be effective in demystifying core AI/ML concepts when the activities are tailored to their interests. Furthermore, we find that cultural background and language may factor into how teenagers perceive AI. Our study contributes to growing research on AI/ML literacy by focusing on teenagers and including cross-cultural perspectives. © 2025 Copyright held by the owner/author(s).
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