Good luck getting the US to ever change. I'm personally on the side that Fahrenheit is more useful for day-to-day usage, because it has a range calibrated to t

Good luck getting the US to ever change. I'm personally on the side that Fahrenheit is more useful for day-to-day usage, because it has a range calibrated to the temperatures experienced in the part of the world I happen to live in. But it would take a whole generation to get people to change their frame of reference into Celsius, which isn't likely to happen, because the biggest interaction people have with temperature is the daily weather report, and it's primarily older people that watch the news. I could get on board with kilometers, if I had to, because the conversion factor is simple enough to do in your head (roughly 3/5), but trying to figure out what anything is in Celsius is just a little too complicated.