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An alum (/ˈæləm/) is a type of chemical compoun...

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The western desert of Egypt was a major source ...

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A microscope (from Ancient Greek μικρός (mikrós...

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Glucose is a sugar with the molecular formula C...

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Zinc is a chemical element with the symbol Zn a...

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In common usage, salt is a mineral composed pri...

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Urea, also called carbamide (because it is a di...

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Urea, also called carbamide (because it is a di...

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