The reward for mining a block is over a quarter of a million dollars these days. $250k / 4k transactions = apx $62.50 per transaction. Around $8 is from the transaction fee from the sender, the other $54 is from the block reward minted out of thin air.

Swamp coolers.

Fans blow over water to lower the pressure, causing evaporation to occur at room temperature.

Evaporating water absorbs heat from its surroundings without raising the water’s temperature as it undergoes a phase change. It absorbs nearly 20 times more heat than it would from being heated from 50 degrees F to 100 degrees.

No, it’s more like checking out every book from the library, and spending 450 years training at the speed of light, being evaluated on how well you can exactly reproduce the next part of any snippet taken from any book.