Geeky Coin Chemistry...almost right

This was in my latest issue of Chemical & Engineering News I just got today:

 

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Makes you wonder why everyone looks for pre '82 cents when all these other coins are primarily copper.

 

That's funny, it's says 1984 up are the same....author was lost! The current cent composition (copper plated zinc) started in 1982.

 

Because getting 3 grams of copper for 1 cent is a better deal than 3.75 grams for 5 cents or 2.1 grams for 10 cents.

 

That's why I said "almost right"

 

Cool. Now, if only we can find a long lost document that reveals the recipe for Greek Fire.

 

Saw that too about the penny, thought maybe I was just wrong.

 

Actually @BadThad, 1982 had both kinds, clad and Cu. Any significance difference or anything to be on the lookout for on that date?

 

Only difference is weight and slamming them on a hard surface to hear the different sound (ie the ring test)