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"Knock on Wood" is a pretty common expression known to most everyone, generally
used to ward off evil and/or to bring good luck. "Touch Wood", has also been used
in some countries at different periods of time. No one knows for sure how far this tradition goes back, but
traces of its use goes back for many generations when it was thought their ancestors were in the trees to help them in life.
And considering wood provided warmth of fire against the cold, cooking, tools and shelter, this oxygen providing renewable
resource has certainly been a great service to man and the world as we know it.
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