Speaking as a SCUBA diver, the equipment is not designed to handle high airflow (such as you need when working hard on a bicycle), so even if the air tank itself wasn't a problem you'd need, at a minimum, a heavily-adjusted second-stage (the one with the mouthpiece) regulator. Possibly a different regulator set altogether. On the other hand, one of the design considerations of a second-stage reg is that the purge valve needs to resist water pressure, including the pressure of swimming; air would generally not have that problem (and you probably wouldn't have any need for a purge anyhow).

Even basic filter masks can cut down on particulate air pollution by a lot. I've spent some time in places with truly horrific air quality - the kind that makes LA seem clear and fresh-smelling - and a lot of people wear something over their face, even just a strip of cloth, when they go out (and sometimes also at night or even all the time). I don't know how practical they'd be at filtering out anything likely to cause headaches in traffic, and they're not terribly comfortable to wear, but it might be an option. Of course, in the US, the most common reason you see everyday people wearing something like that is if they're sick and don't wish to spread germs from their breath / sneezes, so people may be reluctant to shake your hand...

The social stigma of something like that seems like you're basically throwing away any hope of rehabilitation, but it's hardly as if the US is much good at that anyhow.

Orion requires quite a few detonations, though; even with a massive craft (much of which is pusher plate and shock absorbers) to absorb the impact, you have to use fairly low-yield bombs and each only provides a relatively short period of thrust. You could possibly design something that takes higher yields (especially higher relative to the vehicle mass) that would survive reaching orbit on one detonation, but it would be subjected to extreme acceleration - the kind that would crush any satellite launched thus far - and I suspect there might be too much risk of tumbling given the non-uniformity of the atmosphere.

That's worth checking (both in terms of what Apple claims, and in terms of what any relevant legal precedents claim; a hardware warranty certainly shouldn't be at risk from a software modification). On the other hand, it should be easy to "un-jailbreak" a device; just restore an un-jailbroken image onto it (for example, from a backup made before jailbreaking), and you can do so before sending the device in for warranty service. If the device is "bricked" to the point that you can't restore it, then Apple probably can't tell that it was jailbroken, either.

Creating a post in Discussion only requires "a few" points of karma; creating one in Main requires 20. I believe 20 is also required for creating a Meetup post; in most ways those appear to be treated as posts to Main (for example, up- and down-votes on them count for 10x the usual amount of poster karma).

Source: The LW FAQ, specifically http://wiki.lesswrong.com/wiki/FAQ#Why_do_I_want_high_karma.3F

5+ years later, I'm curious: have you attempted this? If so, how did the attempt go? If not, is there a clear reason?

It's probably a lot more effective to draw the water from ~10m down; the infrastructure costs are far lower, you'll probably not need to insulate the water quite so much for coastal regions (to keep it from warming en route to the surface), you won't need to pump so hard (you won't have a vertical kilometer of buoyancy for your denser-than-shallower-water to fight).

For coastal regions, this might actually work, though those tend to be relatively moderate to start with (courtesy of the water). It would be a ton of infrastructure to get in installed in more than a small, clustered set of buildings / public property, though. For inland regions, you then need to pump cold (it's not permitted to warm up much) corrosive (seawater is a pain) water over a long distance in a hot part of the world. Upon its arrival, you still need to get it into the heat exchangers that you have installed wherever financially practical. Then you have to get rid of the resulting slightly-warmer corrosive seawater.

Disclaimer: I don't use iThings except occasionally for work, and those ones are always jailbroken. My knowledge of what Apple does and does not permit the nominal owners of their devices to do is limited.

You may be able to save a backup of your iPad's current state to your computer, with the possibility of future restoration. This would back up both the apps and their data. You could then delete the apps (which deletes their data). If you wanted to play the apps again, you may be able to take a new backup and then restore the old one. Obvious downside here: if you ever do want to revert, you'll have to (at least temporarily) do without the progress you made since the initial backup

Alternatively, delete only those games which sync their progress to an external service, after you perform the aforementioned synchronization. I don't know which games those are, but they exist. Cross-platform ones, and those from major dev houses, are more likely to offer this feature.

... or you could jailbreak. There was a new one just released. You don't have to do much with it except back up your own data, if you want. That's one of the major reasons I rooted my phone.