Physicists hotly debate why certain copper oxide crystals can conduct electricity without resistance, or superconduct, at temperatures far higher than conventional superconductors can.

Magnetism piece fits no-resistance puzzle. (Physics) by Science News

In conclusion, both copper sulfate (a soluble compound) and copper oxide (an insoluble compound) have comparable effects on the induction of gastrointestinal manifestations, implying that similar levels of ionic copper were present in the stomach.

Gastrointestinal effects associated with soluble and insoluble copper ... by Uauy, Ricardo / Environmental Health Perspectives

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copper mica
copper nickel
copper nitrite
copper number
copper oleate
copper ore
copper orthoarsenite
copper oxide
copper oxide photovoltaic cell
copper oxide rectifier
copper pair
copper plating
copper powder
copper pyrite
copper pyrites

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