🤔wish I could code...

Can't the powers that be at reddit just flip a switch somewhere and remove the mods' ability to make subreddits private? Presumably if they could they would have done so by now (but if not, 🤫!!!)

You mean, like this?

😱😱😱

For anyone who would like to read a sci-fi series about what terraforming Mars might look like, there's The Martian Trilogy by Kim Stanley Robinson

Right, I didn't necessarily see it as an either/or type thing--I think we can and should do both!--however, if it does come down to one or the other, it's got to be earth first.

Does Zubrin have any ideas about mitigating the effects of low gravity on humans? The only thing I can think of are these little personal sleep centrifuges I read about somewhere that would approximate earth gravity for at least part of the time.

The magnetic field issue is a biggie, and would have to be addressed before any large-scale colonization efforts could begin, but is hypothetically solvable.