The argument for using SI is simply that you are a) using the same units as everyone else b) using a set of units that connect neatly together so one can actual

The argument for using SI is simply that you are a) using the same units as everyone else b) using a set of units that connect neatly together so one can actually do meaningful calculations with them. And °C is not part of SI either, but is only a constant offset away from Kelvin - which is. And why is 0 is uncomfortably cold and 100 is uncomfortably hot more useful? Same thing as in the article.. avoiding negative numbers - why?