Ask HN: I need ideas to impress fifth graders with technology

A baker came in and had the kids decorate cupcakes. A FBI agent came in and let the kids try on a bulletproof vest & an FBI windbreaker. I’d love to hear what ideas you all might have to totally wow some kids, get them excited about science/tech… And obviously out-wow any firemen, FBI agents, that might be presenting.

Source: news.ycombinator.com