During WWII in 1943, some materials were being rationed for the war effort, and the planchets used for pennies were SUPPOSED to all be made of zinc-coated steel, but a few others managed to slip through, making them extremely rare and thus valuable to collectors.
Want to hear a real mind-bender? The rings of Saturn are super young. That is, by cosmic standards. While our solar system as a whole is around 4.6 billion years old, the gorgeous rings engulfing the seventh planet are estimated to have only been around for a few hundred million. That’s well before human beings…