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Use the Feynman Technique to make sure you understand things. This is perhaps the single most effective studying tool that you can use to focus.
Heuristics help us make snap judgments. But sometimes, what you save in time, you lose in accuracy. And if your heuristics are flawed, your snap judgments will cost you.
…ness. We chose it by saying nothing mattered at all, except winning, conquest, cruelty, possession. Nothing mattered except having the power to make nothing matter.