I do not know why someone in their ignorance (or perhaps on purpose to make knives more evil) started that nonsense. Maybe it was just to impress others with their vast knowledge. It is actually a fuller. On a sword, it makes the sword able to be lighter, more flexible, and still remain strong. On a knife it is not normally necessary, but every ounce of weight savings can make a difference to a soldier or hunter. Marble's made their Ideal knife that had broad fullers on each side. It made for a very light, but strong knife for its size. They popularized the idea. Kabar copied the idea for their famous knife, but made the fullers less broad. Others have copied this idea.
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