London Taxicab drivers who passed <i>The Knowledge</i> were forced to develop very detailed mental maps of London. According to wikipedia, it is the world&#x27;s most demanding training course for taxicab drivers.<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Taxicabs_of_the_United_Kingdom#The_Knowledge" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Taxicabs_of_the_United_Kingdom...</a><p><a href="http:&#x2F;&#x2F;www.nytimes.com&#x2F;2014&#x2F;11&#x2F;10&#x2F;t-magazine&#x2F;london-taxi-test-knowledge.html?_r=0" rel="nofollow">http:&#x2F;&#x2F;www.nytimes.com&#x2F;2014&#x2F;11&#x2F;10&#x2F;t-magazine&#x2F;london-taxi-tes...</a>