* There are many ways that wood can be considered "strong" including how much it will elongate or compress.
* Knowing the way that a certain type of wood is strong means that we can use it more effectively.
* Knots make wood weaker.
* Wood is stronger along the grain, or up and down along the fibers, than it is across the grain.
Well, that sums up our Wood's Strength lesson. Next we will talk a little bit about trees, the mother of all wood, in "Trees are Great!".