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How do impurities affect the critical temperature and critical magnetic field of a superconductor? Develop a theoretical model and perform experiments to investigate the impact of impurities on superconductivity. Compare the results with predictions from current theoretical models and identify any discrepancies. Finally, propose potential solutions for mitigating the negative effects of impurities on superconductivity.
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Deep Thought is thinking for 7.5 million years.

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The answer is 42.

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