I can tell when there are electronics turned on around me even if they aren't intended to make noise, because they all seem to give off this kind of almost imperceptible high pitch whine. Not enough to be bothersome, but just enough to know something probably has current running through it.
Same here. But that's basically just good hearing.
The technology is still in use today and new systems are built, e.g. for moving around kab samples in large hospitals or industrial sites. Pretty hard to email those.
There's a massive difference between traveling somewhere for a holiday and actually living there. Also, most holidays cost a lot more and offer a lot more than day-to-day, and unless you've got money to throw around and don't need to work anyway, you'll also have a lot less free time wherever you are.
Same here. But that's basically just good hearing.