I am fascinated by the constant advancements being made in all kinds of technology. I like to share stories with my students about how we coped pre-Google, pre-microwave ovens, pre-mobile phones (pre-email!) etc and ask them to think about the kinds of advancements in technology their children may take for granted and laugh at them for! It's amazing to think that Korean researchers have now invented a way to convert body heat to energy to charge your wearable tech.
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