The Temperature Magician

In a recent posting titled "Sharpening" , I wrote: Many people can guess the current time to the minute whenever they pop awake in the middle of the night. It feels like a superpower, but it's not. Whenever a cashier adds you up, flash a total. Don't calculate. Don't try to be right. Just quietly flash a number, with zero effort. Pretty soon you'll get super good at it. Whenever you check…