This time in: Superman 2020 (from Superman #357), we learn that copper pennies were recalled in 1988 in order to recycle the copper making pennies priceless collector's items.
We learned more slang from 2020...
Rich people are called, "Roycers!"
"Krazbit!" is a 2020 curse word that I'm too polite to translate here. (You know what it means.)
A "Ten-er" is someone who rates a ten on a scale from 1-10. So perfect.
Oh, and Superman mentions being off target by a half a meter. Yay! In 2020 we finally switch to the metric system!
And ... in 2020 Ice Cream Parlors are making a come back. Hurray!