Mining. In cryptocurrency networks, mining is a validation of transactions. For this effort, successful miners obtain new cryptocurrency as a reward. The reward decreases transaction fees by creating a complementary incentive to contribute to the processing power of the network.
It matters because the actual coffee flavor is extracted from grind better at higher temperatures. I'm not a scientist but I trust those that have done the research and they say that the optimal temperature for hot water in a coffee pot is between 195-200 degrees or just a little under boiling.
Black brewed coffee has around two calories in an eight ounce cup. Not a bad deal for a nice, hot beverage. What a lot of us fail to realize is how many calories are in the stuff we put into our coffee. Half and half; 2 tablespoons (1/8 cup): 40 calories. Whole milk; 2 tablespoons: 18 calories. 2% (low fat) milk; 2 tablespoons: 14 calories.