Which makes sense, considering his last book is &quot;Thing Explainer&quot;, and explains stuff like the &quot;Up Goer Five&quot; (Saturn V): <a href="https:&#x2F;&#x2F;xkcd.com&#x2F;1133&#x2F;" rel="nofollow">https:&#x2F;&#x2F;xkcd.com&#x2F;1133&#x2F;</a>