Big numbers are fun to try to wrap your head around. My favorite is Graham&#x27;s number (which I believe is <i>the</i> biggest number used in a formal mathematical proof).<p><a href="http:&#x2F;&#x2F;waitbutwhy.com&#x2F;2014&#x2F;11&#x2F;1000000-grahams-number.html" rel="nofollow">http:&#x2F;&#x2F;waitbutwhy.com&#x2F;2014&#x2F;11&#x2F;1000000-grahams-number.html</a>