> Tldr: If you aren't a paramedic or higher, you shouldn't be administering insulin or dextrose/glucose either way.

Quickly checked current Australian and uk first aid resources (red cross training), and they do still seem to recommend that first aiders do it (giving sugar/sugary foodndrink) assuming the diabetic person is still responsive. I'd maybe be a bit more careful with wording when giving medical advise or first aid training online without being very specific as to where it applies.

> What things with 4 kids cost more than twice as much as 2 kids?

Cars are a big one. It's not a linear increase, it's a massive jump you're forced to make at a certain point. Particularly for booster seats.

I agree with you otherwise, but there are a few things which do jump up.

Your regular four or 5 seater was already going to be bought, likely even with 0 kids, so the cost is effectively 0 for the first two-three kids (depending on age separation and need for boosters). Then it suddenly jumps up in cost.

Pilobolus crystallinus ? I'm reading up to around 90km/h.

I think your answer is good for speech but it is overly specific.

OP asked about language, this answer is only about speech.

There are good theoretical arguments that the first languages were in fact sign languages (the gesture-first hypthesis) https://link.springer.com/article/10.3758/s13423-016-1117-3 . This article is quite accessible and lists some of the main arguments for it (while ultimately coming to a conclusion that the author things they arrose at the same time).

One argument I remember but that that article didn't mention was the benefits of gesture during hunts and ambushes though, co-ordinating these with spoken language doesn't work all that well unless the hunter is already afoot. And we do see hunter gatherer societies with sign languages (or rather, it is the same language using sign) today still.

Other arguments that are in the article include primates already existing gestural systems, as well as the ability and capacity to teach them some symbolic gestures from sign languages (no, koko did not 'know sign language', but she did know some signs).

As we see this in our modern primate cousins, a greater affinity for signed languages as compared to complex vocalisations, I'd ask why would our ancestors be different? Given the advantages to signed languages at particular times, the developing hand and tool manipulation skills our ancesters were fostering, and the likely already existing gestural system, I'd agree that the gesture-first hypothesis is at least plausible.