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You aren't ""as right"" as Martin, either. Since you insist, I asked you: ""Please show us when the length of the metre fluctuated since the 1983 redefinition due to a change in the physical speed of light. (Boldface in original) You didn't answer, but instead treated us with the nth reiteration of your chronic argument. Following that exegesis, I asked you: ""Now, please answer my question: Has the length of the metre changed since the 1983 redefinition due to a change in the physical speed of light? Yes or no, please. If yes, please cite a reliable source."" (Boldface in original) Still no answer. You don't respond to others' questions or arguments; you merely repeat yours. That accomplishes nothing and persuades no one. I'll leave it to others to make their own judgments about whether your behaviour is tendentious, since there is no way that you will recognize that it is. — (Talk) "