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.
TEMP: Water heated to 195-205ÂºF is ideal for preparing coffee, and some espresso machines allow you to control this temperature. (For most systems, this is made possible by a PID controller.) If yours does, play within this range to find what you like.