Thanks! :) We were really thrilled to post the problem.<p>Our rope question from expii.com&#x2F;solve is a multi-layered math puzzle. If you haven&#x27;t seen it before, the answer is often quite surprising: a human can walk under the circle even though the 710 inches of extra length are shared over the whole earth&#x27;s circumference. Basic human intuition produces the most common answers, which are the bacteria or the ladybug. This helps to illustrate the purpose of math: to help us reason to determine the truth when basic intuition fails. If basic intuition were always right, then we wouldn&#x27;t need math!<p>If you had seen the puzzle before though, you would already know that the rope lifts high, because it lifts by 710&#x2F;(2*pi) inches, which is 113.0000095... taking us to the second layer of math embedded deeper in the problem. That is remarkably close to a whole number, which is surprising because pi is an irrational number. This means that pi is very close to 355&#x2F;113, which brings us to the topic of Continued Fraction representations of irrational numbers, and amazing rational approximations of pi: <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Mil%C3%BC" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Mil%C3%BC</a><p>So, this problem hits at both basic and advanced levels. :)<p>There are many interesting ways to teach math through multi-layered puzzles which have something for everyone, no matter where you are in the experience spectrum. Our goal is to provide these for free, disseminated over the Internet. :)