Some of these "objects" may be projections. The "dot" at the end of a laser pointer defies physics too if you were only to think of it as a physical object of approximately the same size.

I think there are a few tricks military R&D came up with to have people chasing phantoms, but they don't always fill in the public if they see some use outside of a testing range.

For example you might have a beam emitter on the ground that's tuned to around half the frequency needed to excite atmospheric gases. Then you use two of them that are synchronized and phase shifted, and where the two beams overlap - it effectively starts to excite the gas in that zone into ionization. It starts emitting light, and will also reflect radar.

With something like that, you can have other people chasing that around just like you would your pet with a laser pointer.

Not saying all UFO's are that, but some of the current tech developments make this kind of electronic warfare stuff quite possible since it does have some uses. (Other than creating false returns to have somebody chase, it can be used to reflect narrow beam communications or for stuff like over-the-horizon RADAR.)

The kinds of jobs that aren't already subject to outsourcing. Mostly trades work with heavy and/or high-risk labor.

If it's something that can be done over the phone like a call-center worker, it can be done by an AI at some point. At least the time window for it happening is significantly narrow.

An AI that designs improved HVAC systems for server farms which happen to have services for hosting AI software.

If that's funny, then Final Destination is a comedy flick.

Repairability and recyclability. The current status-quo is just piling on the e-waste, and is that a good thing?

In that regard, a crappy 3D printed lathe is about 3 generations away from a somewhat decent lathe. (As machined by subsequent creations with improving tolerances.)

A funny thing is modification or further development of a technology originally meant for fossil fuel production would potentially be a great form of clean energy. That would be using deep boreholes to tap into geothermal energy, and done using large scale drilling rigs. But it is a bit complicated to implement, conflicts with the other use of the technology, so nobody really has invested in it. It could likely go a long way into electrical power production if it were seriously looked into. (And not quite the same as open injection or drilling into existing geysers for geothermal - which both have their own share of issues. I'm thinking more along the lines of closed loop systems that recirculate the heat transfer fluid.)

Space junk in other words. It could be something as innocuous as a detached panel, or perhaps a nut or bolt that doesn't seem to match any of the dimensional standards used by us here on Earth. It could be something we may not quite recognize as alien until there's enough people working out in space to specifically look over things like that.

Homelessness and things like health care are used as the stick to threaten labor into working under less than desirable conditions. If it were purely left into being a technical and resource pursuit, it would have been solved yesterday. Yes some would need to be institutionalized, others would need to be minded enough just to keep their lives in order, and some just need to be saved from addiction or untenable financial problems. But politically handling any of those seems to be a hot potato problem.

It's not an issue of available housing. There's more than enough. A segment of the population is purposely stigmatized and societally stranded to fend for themselves out in the elements. If they even do something as simple as making shelter for themselves, it's torn down by law enforcement. Somehow that is "for their safety" even though nobody seems to care if they die from disease or exposure.