None. When i was a kid I was fascinated with the apollo program now, not so much. Same technology put on hold for 50 years and started up again. Fuck Musk, Bezos et al for their rockets. Nothing new just overly rich people playing with their toys with our money. Lets not pretend they are doing something new. Kamen invented booster landing tech 25 years ago. Remember the segway?

Rockets blasting into near earth orbit. Wow. Pinch me. And smaller and less powerful than the Saturn rockets of my youth. Wow.