Today, confident scientists can at least venture a possible explanation for almost every phenomenon. Humanity’s collective knowledge is expanding at an extraordinary rate. Nevertheless, there are two particular areas in which we remain largely in the dark about (literally): the depths of Earth’s oceans and outer space. The Moon landing of July 20, 1969, remains one of the most significant events in human history. Courageous astronauts, guided by brilliant, often unsung minds like Margaret Hamilton, reached the Moon’s surface for the first and only time to date. And they did so with remarkably unsophisticated technology—Apollo 11’s computer had a rope for memory!