Originally published at: https://boingboing.net/2018/08/09/watch-these-amazing-and-easy-a.html
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In the 50s, pre-helicopter parents, and when city dumps were unsupervised, a friend and I found several glass carboys full of nitric acid and a stash of zinc strips. We took both home and filled a few weather balloons with hydrogen, tied notes to them and released them. We never received any replies.
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