<story><title>The fifth hyperfactorial: 5⁵ × 4⁴ × 3³ × 2² × 1¹ milliseconds is exactly 1 day</title><url>https://twitter.com/fermatslibrary/status/939499914794594304</url></story><parent_chain><item><author>monochromatic</author><text>Slightly off topic, but my favorite units for c are feet per nanosecond. In those units c = 1 (plus or minus a couple of percent).</text></item><item><author>greenleafjacob</author><text>Units of time are specifically chosen to have 5, 2, and 3 as factors. It doesn&amp;#x27;t look so pretty when you compare with universal fundamentals:&lt;p&gt;&amp;gt; 1.000692286 milliseconds – time taken for light to travel 300 km in a vacuum</text></item></parent_chain><comment><author>bouvin</author><text>No mention of the foot per nanosecond is complete without this seminal scene between the great, late Grace Hopper and David Letterman: &lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;youtu.be&amp;#x2F;1-vcErOPofQ?t=4m43s&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;youtu.be&amp;#x2F;1-vcErOPofQ?t=4m43s&lt;/a&gt;</text></comment>
<story><title>The fifth hyperfactorial: 5⁵ × 4⁴ × 3³ × 2² × 1¹ milliseconds is exactly 1 day</title><url>https://twitter.com/fermatslibrary/status/939499914794594304</url></story><parent_chain><item><author>monochromatic</author><text>Slightly off topic, but my favorite units for c are feet per nanosecond. In those units c = 1 (plus or minus a couple of percent).</text></item><item><author>greenleafjacob</author><text>Units of time are specifically chosen to have 5, 2, and 3 as factors. It doesn&amp;#x27;t look so pretty when you compare with universal fundamentals:&lt;p&gt;&amp;gt; 1.000692286 milliseconds – time taken for light to travel 300 km in a vacuum</text></item></parent_chain><comment><author>letlambda</author><text>Which leads to my favorite way to think about it. One foot per clock tick of a 1Ghz processor.</text></comment>