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I'd looked the article up when I saw it on Boingboing. I think they mentioned that they would recapture the ants before making the cast, because I was wondering about that part too.
I liked the part at the end where they made an artificial nest, put ants in the chambers, and dug it up some time later (thus finding out that the young ants would go to the bottom and the older ones went to the top). Lots of fun was had by all, I am sure.
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