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They were possibly confusing nitrogen with carbon dioxide. CO2 will definitely lead to distress in high concentrations, and has been used in some slaughterhouses.

What's the charging efficiency?

Most electric cars only have 1 gear and it's always engaged. If you put the car in reverse, it uses the same gear, but the motor spins the other way.

Even in neutral the motor still spins when the wheels are turned, it just doesn't output any power to the wheels.

I have used Kagi for several weeks and can't go back. I can finally find things on the internet again and I don't want to lose that again.

If you don't mind paying to use a search engine, Kagi is actually pretty good. Not as good as Google was 20 years ago, but significantly better than any other search engine I can find today.

It depends on a lot of factors including the battery chemistry.

NMC (Lithium ion) batteries are common in high performance cars and older EVs. They should be kept between 20% and 80% charge for normal use. 60% is ideal for storage, but anywhere in that range will do.

LFP (Lithium ion) batteries are common in cheaper and newer EVs. They don't have a problem with being stored at 100%, and do have issues with not being regularly charged to 100% (monitoring gets less accurate over time until fully charged again), so leaving it at 100% is fine.

Lead acid (particularly calcium) batteries get damaged when discharged too much, so it's fairly important to keep them topped up. If you are leaving the car for a long time, it could be worthwhile to connect a trickle charger to the 12V battery to prevent the car's computer from gradually draining the battery. Some cars will top up the 12V battery from the high voltage battery if left for a while, so this may not be needed.

While I have little experience with low temperatures, I suspect that the car will be fine if left as stated above. The battery shouldn't get damaged by low temperature storage, and shouldn't lose much charge over time. Just don't expect full performance immediately after returning to it.

It's likely been hacked by someone who guessed the default login details (when was the last time you changed the password on your washing machine), and is being used for malicious purposes such as DDoS attacks.

Start today. Download VirtualBox (or equivalent software) and if you make a mistake, you can just nuke the OS and start over without risk.

You can always try Linux risk free in a virtual machine like VirtualBox.

If you like what you see, and you have any valuable data backed-up, you can try dual booting. That way you get to use Linux as your primary operating system, but can switch back and forth as much as needed.

I found I was dual booting Windows and Linux for over 3 years before I was comfortable enough to stop using Windows entirely. Switching to Linux doesn't have to be an all-or-nothing approach. You can take it as slow as you want.

The surgeons handle this regularly, it's routine for them. You get to relax and let them manage everything.

I went through lung surgery a few years ago and coped by deciding that I could trust the surgeons (and other medical professionals) completely. They know what they are doing, and they have procedures in place to make sure everything goes well.

Learning to consciously relax and trust everyone around you is a something that takes constant effort, but in my opinion, it's worth it.

My surgery went well, no complications, and my recovery was exactly on schedule.

If you are worried, a qualified medical practitioner is always more reliable than a web forum.

Insufficient or poor quality sleep can cause problems with attention and memory, and can exacerbate existing conditions.

Poor sleep could be caused by a medical condition (sleep apnoea), or psychological (stress). Often stress can be hard to identify, particularly if it's long term stress.

Again, this might not be your problem, and finding the right doctor who actually listens to you is important. Don't be afraid to try more than 1 doctor if the first makes you uncomfortable.

Adequate for cargo flights, not happening any time soon for passenger flights. Aviation safety is very strict and slow to change.