In the American Museum of Natural History in New York City, they have a tree ring from what might be the oldest tree ever found. Next to that gigantic slice of wood on the wall is...a giant plaque. The plaque describes in detail how measuring the life of a tree from tree rings works, as well as the history behind that particular tree and when it was cut down.

In fact, as I recall, there was such a plaque next to almost every exhibit in the entire museum.