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@Constable_Savage
Oh yes, at junior school aged 9-11. The same teacher showed us a glass jar about the size of a jar of pesto. It was full of mercury until he dropped it on the classroom parquet flooring. Little silver balls shot everywhere which we kids swept up on sheets of paper. I had a pool of it in my desk for weeks. It would roll about under the dust and pencil sharpenings repelling everything it touched.