Common misconception - it can, just not very much, so the volume change is tiny, and in practice, there's usually something else in the system that is changing volume by a larger amount- like air bubbles, or if there's anything elastic in the plumbing, it will stretch - but regardless, water absolutely can be under pressure.
resistance only reduces current, but when I think of hair in a pipe, the pressure after the obstruction would also be lower
You are correct, in electronics, resistance drops voltage (assuming the load is in series with the resistance). In fact, a cheap quick and dirty digital to analog converter uses a bunch of resistors to supply different voltages...
Lol I had one like that - I made a copy for a friend, but it wasn't just one code word, it could be any one of about a hundred - but he was dedicated, he figured it out somehow over the course of a few weeks.
Correct. But who can tell the difference beforehand between a normal update and an abnormal one? The problem is Windows tends to hide those details. I've sat on support calls where a server needs to be rebooted for some configuration change, and Windows insists on applying updates because hey, you're rebooting anyway, so what if it takes 1/2 hour to do this thing that should take 5 minutes...
Helium in balloons is returning to the atmosphere. We can re harvest it if we want
No. It wafts away into space. All the helium we find is a product of radioactive decay- alpha particles- which gets trapped underground. Once it's released into the atmosphere, it is effectively gone.
If there was one food that would supply all my nutritional needs, didn't need to be refrigerated and could be kept for months without going bad, that'd be a hell yeah from me.
People also used to smoke in offices. Safe and professional is a relatively new thing.