Let’s all go around the table and say what we learned this week. I’ll go first.
While I knew that 32 Fahrenheit = 0 Celsius and 0 Fahrenheit = -17.77777 Celsius…
I did not know that -40 degrees Fahrenheit = -40 degrees Celsius!
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2 Things @ Once 
I did not know that a baker’s dozen = 13
Whooo-HOOOOOOOOO!
Here’s the formula I remember from high school: F = 1.8C + 32. You can see that when C = -40, so is F.
(When I was in the UK though, people were spitting out the equivalence in less time than I could multiply by 1.8. I asked how it was done so quickly, doubting the density of autistic-savants in the population I met, and I was told that they approximate by doubling the temperature, then adding 30. Or: F is approximately 2C + 30. Much quicker.)
Thus ends this short algebra lesson.