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A stone that fogs a plate
Lumen · High school
Curie's pitchblende is more active than uranium. Isolation and the photographic plate are the household problem, not later radium lore.
Student age
10years · 5th grade
Lumen · High school
Curie's pitchblende is more active than uranium. Isolation and the photographic plate are the household problem, not later radium lore.
Student age
10years · 5th grade