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[–]Zapped 3 insightful - 2 fun3 insightful - 1 fun4 insightful - 2 fun -  (0 children)

It is true. Older homes have much denser wood and anyone who has to drill or cut on it knows how much harder it is. Also, both of those pieces of wood in the photo have been recently cut. The bottom piece has aged, as evident from its darker color. I have seen sap oozing out of woodwork that is 50 years old. Both of those pieces in the photo are fairly new, since the older studs are true 2x4's and not the 1.5" x 3.5" like today. The difference in ring size in newer lumber can be due to what part of the tree that piece came from. Those machines size up the tree at the mill and know what size pieces you can get from it before the saw does it's thing.