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What would you bring to an adult show and tell?
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If the timing is right, I would bring a mushroom grow bag with mushrooms sprouting.
If not... probably my radiacode gamma spectrometer and some of my radioactive items. Maybe a clock with radium painted dials and a piece of trinitite. I think that there are many different points of discussion that can be of interest to a broad audience (radioactivity, spectroscopy, electronics, US labor law story of the radium girls, nuclear explosions, background radiation.... etc). As a bonus I can bring a UV flash light and show the radium fluorescence. Adults love UV flash lights.
Reminds me of a prank that a physics professor pulled on us. He put the trinitie sample in a large/elaborate Giger counter and then slyly kicked it into test mode while recounting what Trinitite was. “Oh… wait, that’s not supposed to be radioactive…”