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Thank goodness I still live in a world of telephones, car batteries, handguns and many things made of zinc.

Aren't car batteries made out of lead, handguns out of steel, and phones made out of plastic, fiberglass (PCBs), and random other assorted stuff?

(Even gunmetal which used to be used instead of steel is listed as only 2-4% zinc)

It's a Simpsons reference :)

Which itself is a reference to an old sponsored educational reel, made familiar by MST3K https://youtu.be/FkUVn0JiTz8