Why Do We Knock On Wood?

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In this video:

You’ve probably said this phrase and performed this action countless times, without the slightest clue as to the meaning behind it. So why do we feel compelled to “knock on wood” as an insurance policy against bad luck?

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Sources:

http://www.amazon.com/gp/product/0060...
http://www.worldwidewords.org/qa/qa-t...
http://mentalfloss.com/article/50079/...
http://www.stuffyoushouldknow.com/blo...
http://en.wikipedia.org/wiki/Knocking...
http://voices.yahoo.com/popular-phras...