> putting in 12-14 hour days of pulling a sled in minus 40C, you have to
Oddly they include the redundant "C" for -40 but don't include it, or the "F," in the next paragraph:
> by running outside naked in minus 30 and rubbing yourself down with snow
Then they restore redundant ones a few paragraphs later:
> * It may be as low as minus 40C outside* . . . which in minus 40C is quite high