Why is Alex considering joining a mining pool?, He wants to buy more mining equipment., He hasn’t earned anything by mining alone., He doesn’t want to pay electricity bills., What is the usual pool fee mentioned by Mark?, 5–10%, 0.5–1%, 1–2%, Why does Mark say solo mining is difficult?, You need a lot of mining power to compete., You have to update the blockchain manually., Your computer must be turned off regularly., Which mining pool does Mark currently use?, Slush Pool, F2Pool, Antpool, What does Mark say about calculating mining profitability?, It depends mostly on Bitcoin's market price., It’s easy if you have the right calculator., It involves several changing variables., Why is electricity cost important in mining?, Because it helps cool the room, Because miners use a lot of power, Because it changes daily, What do miners need to monitor besides electricity cost?, Their connection speed, Their internet provider, Their equipment's power consumption, What does Mark say about mining difficulty now?, It’s getting easier for new users, It increases as more miners join, It is controlled by pool managers.

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