If you're not an expert in something, don't pretend to be an expert. This is going to serve you well both in your academic career and in your kissing career. Moving on! So unlike me from the past, I'd argue that Columbus has a deserved reputation in history, but was he really the greatest sailor of the 15th century? Well, let's meet the other contestants. In the red corner, we have Jung Ha, who, when it comes to ocean-going voyages, was the first major figure of the 15th century. And in the blue corner is Vasco da Gama from scrappy little Portugal, who managed to introduce Europeans to the Indian Ocean Trade Network.