SpaceX Graduate Mechanical Engineer interview questions

I interviewed for the Graduate Engineer position, which is basically an internship but for people who will have an undergraduate degree. Interview process was two 30 minute phone calls with senior engineers. First was pretty non-technical, asking why SpaceX, going into my experiences, a behavioral or two, then some pretty easy technical questions at the end. The second was very fast-paced with a lot of rapid fire, challenging technical questions.