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<p><iframe width="560" height="315" src="https://www.youtube.com/embed/M3GQM7tuq2w?feature=oembed" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen="" title="How Luminiferous Aether Led to Relativity"></iframe><cite class="hatena-citation"><a href="https://www.youtube.com/watch?v=M3GQM7tuq2w">www.youtube.com</a></cite></p>
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