One of my kids’ science teachers made a point about the chic paranoia toward “chemicals” and the general ignorance about thr most basic science by circulating a petition against dihydrogen monoxide. Kids all over the school signed it enthusiastically.
Sigh.
The embarrassment after they had been hornswoggled.
Probably healthy though! Might make it less likely to happen when they’re older. 
Scientists have been weighing rainbows.
I’m such an idiot. I did the same at breakfast and completely missed it. Obviously I need more sleep.
I’m wearing grandma’s crystal set today. That must have inspired comprehension.
I wonder if the holes in Mary and Joseph were added in post.
Yeah, those don’t really make sense unless you want them to look like dinosaurs.
I labelled a carboy with “55.5 M Dihydrogen Monoxide” and it was the molarity that freaked our chemical safety person. The warnings are also classic “pass the buck”. The safety data sheets I get for something as safe as sodium chloride says to mix it with a combustible solvent and incinerate.
That’s funny! “Pass the buck”–great description. The guidelines to use liquid nitrogen include to gown up, wear goggles and, I think, a mask. The stuff is really pretty safe if you are reasonably careful.
And there’s nothing better than getting the new person to help you pour some liquid nitrogen out of a large dewar, spill a little on your foot, and then fake a massive injury. Freaks them out every time.
If you have enough ventilation. Ask the guy who was using liquid nitrogen for cooling in a closed space and stayed in the room a little too long. The guy outside heard him hit the floor which was good as he was able to ventilate the room and get him out.
That is true!
I’ve often wondered about this myself. It seems to me a classic “cry wolf” scenario where all their more needed warnings on much more dangerous chemicals are deprecated when one sees they are over the top on their warnings about plain table salt! After all, if they’re willing to act that dire about salt, then maybe all the rest of their warnings are exaggerated too! I’ve never figured out why anyone would shoot their own system in the foot like that other than the usual litigation sensitivities which force them to do it (to the same result).
[Besides … NaCl often also comes with another toxic component in it: Iodine! Strike two!]
I was a kid long enough ago that chemistry kits were not boring, and sold with chemicals which would make a liability lawyer choke - literally. The more awesome chemicals came in bottles marked with skulls and crossbones.
There were train tracks nearby (just our demographic), where chunks of sulphur would come off the bulk cars. I read that heating this in a test tube with paraffin wax would produce lethal hydrogen sulphide gas. In my basement lair, I drew glass tubing into a nozzle though a stopper, and lit the off gas to a satisfying flame, which was oxidizing to the somewhat less poisonous sulphur dioxide.
My mother was unawares upstairs, where she though the gates of hell opened up and filled the house with the rotten egg stench of brimstone. Fortunately or otherwise, I survived my childhood to do engineering with gases on a much larger scale; all legit - no need to call Saul.