Interesting question. I’m going to assume that this capsule will be opened by everyone in the future – not just my family. A newspaper comes to mind, as long as the paper is protected from such a long period of time. A kindle to show the digital version of paper books, etc. A copy of the recent Pulitzer Prize winners. Yet, all of these things are knowable in the future. Perhaps something that shows what society values, and doesn’t value. A TV Guide, for example. Coins, a school yearbook, cell phone, photographs, to mention just a few. It depends on how long this capsule will be buried.