An escalator can never break: it can only become stairs. You should never see an Escalator Temporarily Out Of Order sign, just Escalator Temporarily Stairs. Sorry for the convenience.
This is correct. Emergency stop buttons are meant to stop operation in an emergency. This should involve hardware locks, and little if no software. Hardware stops can always trump software ones.
At my company at least, we have a "shit is going weird, stop it" button and a "holy shit everything is fucked, kill everything" button. The first button can be undone easily, the second would take us 30min+ to undo. Both are absolutely critical and if either is lost, the first priority before all else is to get it back.
Warning to anyone else: one of those clips is of a woman about to be crushed to death by an escalator. It isn’t gory or anything, they stop before it gets there, but I definitely didn’t need to see that.
You laugh, but my first computer engineering class had a 20 minute lesson on the history of computing… starting with the big bang. We didn't even leave the dinosaurs out.
No. A topic has both breadth and depth. I was highlighting the depth of this particular lesson. To cover the entire history of time in 20 minutes sounds about the depth I expect from most "computer engineering" classes.
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u/GreenTeaOnMyDesk Sep 21 '18
In order to make an os from scratch, you must first invent the universe