As a compliment to the "Things that have disappeared" thread, I'm introducing this one, about those things that seem unaffected by the passage of time. I don't mean simple tools like clawhammers, but products that were new within, say, the last hundred years, and have defied change ever since. My first example: Recently I was in the toy department of a store when I noticed a display of Silly Putty. It was sold in plastic eggs, exactly like the first Silly Putty (the brand I first encountered was sold as Nutty Putty) I ever saw, some 60 years ago. The only noticeable difference was the day-glo colors on some of the eggs. Some products are nearly perfect when first introduced and are very resistant to change.