[nine_k]

> How much work and knowledge of taxpayer funded NASA did SpaceX reuse.

Judging from the way SpaceX builds, fuels, and flies their rockets and engines, very-very little.

Their contracts with NASA and later DoD did, of course, play a significant role. But I suppose they were chosen on merit.

[tremorscript]

We are all standing on the shoulders of giants. Now I am not a space engineer, but I doubt SpaceX invented a whole new way to reach space.