> unnecessary conversions can be a livesaver So your premise is that being able to convert quickly in some situations is a matter of life and death, and you would rather do MORE math than LESS? What in the world are you talking about? > much of the metric scale How much? > ... is linear Really? Why do they name every 3 digits then? That's not linear. > almost nothing in nature [scales] linearly What are some things in nature that scale, and how do they scale? You sure seem to know a lot that isn't so, but maybe I'm in the wrong.