Comment by wongarsu

As is landing rockets on the launch tower (or as SpaceX would say: catching them). And I might be wrong, but I believe they are the first to use a crane on the launch tower to stack the rocket. Usually you do that before you roll it out to the pad. They were also the first to fly a full-flow staged-combustion engine. Maybe that one was less radical because prototypes have been around for 60 years, but SpaceX were still the first to actually fly one