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@vasilis I realise that's not what you asked, but I hope it's helpful.

To actually answer the question, I'd say one topic that's really cool is all the GIS stuff we do these days. Make sure to give real-world examples, e.g. companies that take satellite imagery to optimise ... farming, forestry, maintenance of key infra (like roads, railways, power infra, etc), to spot deforestation or other land change, to optimise urban planning, etc. I think it's a very visual example of tech being useful.