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What is the critical temperature at which a certain metal becomes a superconductor? Use experimental data to analyze the transition from normal conductivity to superconductivity and explain the behavior of the material in terms of its electron pairing and energy gaps. Additionally, discuss the practical applications of superconductivity, such as its use in magnetic resonance imaging (MRI) machines, and highlight any challenges or limitations associated with these applications.
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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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