Each concept here is mapped to its prerequisites — the ideas you'd need first to understand it — all the way down to four foundations: Space, Time, Energy, Pattern. Click any prerequisite to drill down, or scroll for the chain graph.
External reference — all senses of the word “nickel” on Wiktionary. This atlas concept maps to only the slice of meaning relevant to the prerequisite graph.
Nickel: A hard, silver-white transition metal with high corrosion resistance and ductility, used in alloys, electroplating, and high-temperature applications.
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