> ...and? What's the problem supposed to be? Read the whole thread, start to finish and the context should make it clear. > I've never seen anyone be confus

> ...and? What's the problem supposed to be? Read the whole thread, start to finish and the context should make it clear. > I've never seen anyone be confused over the idea that the speed of light is 300,000,000 when measured in meters per second, but 186,000 when measured in miles per second. Right, because unit conversion is not confusing. But what can be confusing is unit re-definition, which doesn't happen very often and can seem counter-intuitive at first ("how can a government seemingly change the value of a natural constant?!").