Having lived in Europe and the US, I see what he's saying. He's referring more to Miller's "seven, plus or minus two" guide for the human's ability to differen

Having lived in Europe and the US, I see what he's saying. He's referring more to Miller's "seven, plus or minus two" guide for the human's ability to differentiate values along a single axis. With Celsius, you're using an extremely narrow range in day-to-day life, the most common use case. Do I need to wear layers today? Hmm, there will be a high of 21, and a low of 15, so I guess I should grab a vest. If I ask someone the forecast, and they say,"around 20 degrees," I don't know if I'll need the vest, as that could cover 18 to 22 degrees. Except in rare circumstances, you're not going to need to tell people it's going to be 40+ degrees. If you do, you don't really need the precision anyway, as anything above 30 degrees is probably going to be "hot." Therefore, that 40-100 range (and beyond) is basically useful for cooking. Sure, it's important on a day-to-day basis, but you generally have specific targets for what you're cooking.[1] I'd argue Fahrenheit is even more useful in cooking, as the difference in one or two degrees Celsius can ruin your fish. Fahrenheit, with a broader range, is easier to digest and more resilient to signal loss. "Forties" means "wear a coat," "eighties" means "call in sick and go play," "nineties" means "I wonder what's playing at the cinema so I can sit in air conditioned darkness." Peace comes at -40 degrees, when C = F. [1] Don't get me started on gas marks, from the people who brought you L.s.d.