Thought I'd share this response I got from another forum:
My understanding of the derivation of the word "wood" originated around 40,000 years ago. Og was trying to make a good spear point for hunting that would penetrate the think hide of the wooly mammoth and yet be easily portable. So it would fit his hand, he rolled a log up and down a rocky hillside, wearing the bark off and creating a relatively round shape.After all the work, Og found out that the spear was too long and decided to remove about 10 cubits of length - that'll teach him - tree was too tall! After much thought, Og decided to put the spear down by the prehistoric beaver pond in the hopes that the beavers would chew through the spear and shorten it. After a week, Og returned to the pond and found the spear chewed off to a length of about 8 cubits! And the end of the spear now had a nice point on it to boot!
Og and is best buddy, Gog went hunting with the new spear. They stalked, walked and crouched around for days, but no wooly mammoth were to be found. Suddenly, out of nowhere, a large bird flew over them and started circling to catch a updraft. "Throw at bird," screamed Gog! "Wood hit me in head," answered Og.
And that is the rest of the story.