Such practical good advice!
Chemgal sends in this unusually funny fourth-wall break.
Understanding hotel etiquette.
From Boise Ed, who gets the intended joke but remains dubious about there being something actually funny going on.
And a LOL from Usual John:
Comics I Don't Understand 
Quick T/F prompt for our house experts from the physics/physiology community…
T or F?, There is an actual connection between helium making balloons rise and it making voices rise.
Mitch: T. The sound waves travel faster through helium, producing the change in sound. They travel faster because helium is lighter. This changes which frequencies within your voice stand out (as Powers notes) And because helium is lighter (lower atomic weight), it rises in air.
Why exactly does helium make your voice sound so weird? – WHYY
Inhaling helium will make one’s voice seem more high-pitched. It doesn’t actually raise the pitch (just as sulfur hexafluoride doesn’t lower it) but it changes the resonance frequencies, bringing out different harmonics than we normally hear.
Very in-ter-ess-ting! The info bit that I half remember seeing also said True, but with slightly different theory from both of the ones you have presented for the voice effect. They said there actually Isa pitch change, because the lighter molecules can be moved more easily, and hence faster by the vocal cords, which thus can vibrate at a higher rate.
Yeah, that could actually be correct. I’ve never had the physics of it explained well to me.
I think that the point of the airplane one is that when the plane hits unexpected turbulence, all the human passengers are – disconcerted, some injured, all upset. The crash test dummy is happy; this is, literally, what he was made for.
@ SteveHL – Your analysis seems perfectly accurate, but I think I agree with Boise Ed. The problem with the gag is that there was a fatal turbulence incident just over three months ago (almost certainly occurring before that strip was drawn). Perhaps depending on kids to vet the material isn’t such a great idea.
In a church that is not heated or air conditioned, the pipes in a pipe organ will go flat in the winter and sharp in the summer. The reason for this is that cold air is more dense than warm air. The heat or cold does not make the pipes expand or contract very much — otherwise it would go sharp (shorter pipes) in the winter and flat (longer pipes) in the summer. But higher density air in a given pipe acts like the same amount of normal-density air in a longer (and therefore flatter) pipe. Flute players know that their flutes play flat when first brought in out of the cold and have to warm up to normal pitch.
Here is what happens when you breathe helium and play the flute: https://youtu.be/zHb4Tn97JNA?si=qp94wUJVdTlqJ5NQ
The comic with “Rae” left me befuddled. The middle panel’s exposition makes no sense. I thought it was winding up to a tortured Pearls-Before-Swine type pun, but the ending went nowhere.
Forget the species portrayal, just treat these as contemporary people. Rae goes on and on in nerdy detail about her activities, more detailed than a “What’s up with you lately?” polite inquiry requires. (And we don’t need nor want to actually follow the details.) Then her friend, in her turn, has actually big news, simply stated. So Rae Isa bit abashed, and sort of expresses that.
Also kind a play on the “adulting” meme.
I got the gist of the joke, but as I said the exposition had oddly specific details that I was expecting to pay off. I can’t think of many strips that had made random references to model trains. :-)
I get it, Pearls Before Swine it is not. :-D