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There’s no substitute for practicing with the real thing, yet sandboxes can remove the downside of the mistakes you inevitably make when practicing. At the intelligence agency, we’d always practice and rehearse before an operation in an environment in which it was safe to fail. We treated the practice as if it were the operation itself; we’d do all the things we planned on doing during the operation and tried to predict and respond to all the things that could conceivably happen. If something didn’t go as planned, we would adapt. And sometimes we’d fail. Failing in that sandbox, though, provided a learning opportunity with few real-world consequences, whereas failing in a real operation could cost people their lives.