RoyMustangela

How bad would you say your vision should be for Lasik to be worth the risks? I think I'm like -2.5 or something and I'd love to get Lasik but on the other hand it's not like contacts are that big of a deal

what safety systems are in place for emergencies? How would passengers evacuate from an underground vacuum tube if the system loses power or an earthquake damages the tube?

Thanks!

What exactly is being tested here? It seems like the question of will crashing a spacecraft into an asteroid change its momentum is just basic physics right? Is there reason to think it wouldn't work as well as it should? Or is this more of a test to see if you're able to hit an asteroid at high speed in the first place? And what will the closing speed be? Thanks!

How much electricity can you carry at one time?