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How in the world can anyone say that there are no such thing as teeth(fin) and striations! They are obvious! I can see the striations with a 30X microscope! The only reason that they are not visible...

The term "to sharp" has usually been used to refer to an edge that is very unforgiving, such as the feather blades. When the edge is that sharp you also will slice right thru any minute bumps on your...