&gt;* There would be no superconductive magnets.<p>Can you expand upon this?  I&#x27;m unclear as to which of Einstein&#x27;s theories you are referencing.<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;History_of_superconductivity" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;History_of_superconductivity</a>