Tim, giving both values is excellent. Most of the world uses the metric system. As an engineer I see the value and simplicity of the metric system. The metric system provides perfect correlation between linear, area, and volumetric measurements unlike the English system. (e.g., even the English has converted to the metric system). Tim, more information is always better than less. In your narrative on using the Celsius system today, you sounded unnecessarily defensive. For the love of God, you added information without diminishing the previous. You are enlightening people. You need not apologize to the vocal minority that seems to revel in their ignorance.