Articles by Issah Merchant Issah MerchantIssah Merchant is a Year 11 student at Harrow School, where he is taught by Natalya Silcott. At school, Issah and has given talks on Topology and the Euler characteristic, the Riemann hypothesis, and Euler’s Identity.All articles by Issah On curvature: cars, clothoids and cartography5 March 2020Issah Merchant discusses the geometric principles behind, and real-world applications of, curvature