Some of us are aware that -40° Celsius is also -40° Fahrenheit. It's the only point where the two scales agree.
But did you know there are palindrome temperatures and they're very useful also!
16° Celsius = 61° Fahrenheit
28° Celsius = 82° Fahrenheit
There might be some more obscure scale where this is also true, but I _think_ temperature is the only thing where metric and imperial units can be converted with a simple (single-digit) ratio. That's because in 1777, the Royal Society redefined Fahrenheit to be exactly 180 degrees between freezing and boiling water — which, of course, is a 100 degree span in Celsius or Kelvin.
Aaron Toponce ⚛️
Matthew Miller
Cassandrich
Farce Majeure