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From the web... Plaster of Paris is...based on calcium sulfate hemihydrate...created by heating gypsum (a naturally occuring mineral). It's used for a variety of things, including making dentures. I don't think a dentist would put it in your mouth if it would harm you. (That's not saying a...

As a kid, my "brilliant" lab ate some glow-in-the-dark marbles that I got as a prize in some cereal. (I think it was because they smelled like cereal). Mom said she went and looked for them in the backyard the following eveining and they had passed, but she didn't tell me about them and let...