Just a short travelogue from me today. I spent the last week in Czechia. What took me here is a story that goes back to an encounter on a beach in Portugal, over ten years ago, with a Danish science demonstration group. They were doing lots of wacky stuff with plenty of fireworks, liquid nitrogen, and explosions. I was seriously impressed by their ability to engage young children. They had a crowd of Portuguese kids around their stall, who didn’t understand the English commentary, but they

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