As Gwynne Shotwell (President of SpaceX) in some interview said something along the lines: "We are standing on the shoulders of giants" Basically they didn't s

As Gwynne Shotwell (President of SpaceX) in some interview said something along the lines: "We are standing on the shoulders of giants" Basically they didn't start from beginning, but just continues from the point where knowledge has been accumulated over those years.