What are the main differences and is there a reason why dragon has not been the main consideration for a while now

Saw this by Scott Manley

https://youtu.be/bCZSYLS2X9M?si=gjzi7HYlPnumYaD2

If you don’t want to click, the gist is, we can use compressed air to launch smaller stuff.

If that’s the case, why shouldn’t we use tidal power to compress the air ahead of launches since most launchpads are close to coasts?

Can anyone recommend any books or documentaries or podcasts or anything? Would love to learn about the scientists who took care of the monkeys before launching them. Thank you.

If this were to happen, when would this be in effect? And would this and Orion sustain Artemis 3, and be cancelled for IV, V and beyond?

Does anyone know how this congress will vote compared to obamas cancellation in 2011? Is there a funding bill expected to include this later this year?

Before everyone says everyone is scared of the admin… I think as a space industry enthusiast I’d like to be educated and informed.

I'm having troubble understanding how spacesuits are sealed between the arm and glove joints while being able to rotate the wrist. Can someone explain it? I've found some information on the matter but they often don't get too in depth about the rotary sealing. Is there some type of o-ring? A shaft seal?

Thanks!

Like an outer ring-like combustion chamber, and we have a sequence of decreasingly smaller sized inner combustion chamber for rotating detonation engines nested together, that will be huge if we can do that