It's debated. One source points to the lower end of the scale established as the freezing point of a brine made by dissolving ammonium chloride in water.
Paraneoptera
Plausible. What's definitely true is that the George association has zero support from any reputable published source, and is just speculation.
Yeah, it's bogus. This is some speculation that someone put in Wikipedia but there's no published source. It's just a folk etymology that some enthusiast thought was endearing. Not a single reputable source will substantiate this, like most folk etymologies.
You are potentially both correct. But since we can learn to improve articulation at any age, it's likely that you will pronounce the sound more clearly and correctly if you train yourself not to allow your lips to touch.
Thanks for bringing up MacMillan. Manon Auffret has more recently researched the newspaper coverage of Gage, and her research adds a great deal of evidence supporting MacMillan's arguments. Basically, there's a lot of sensationalist and verifiably false stories about Gage. There's no evidence from the time period of personality changes, and a lot of the wild stories appeared decades after his death, probably fabricated. Allegedly Gage was a drunk, but the evidence shows he abstained completely. Allegedly he beat his wife, but evidence shows he was never married. Allegedly he was a circus performer but there's no evidence from the time period to support this.
I think it goes back to Fannie Farmer in 1896, who wrote the first major and comprehensive cookbook in English that used any kind of standard measurements. European cookbooks mostly used vague instructions without any standardized weights or numbers before that. At this point in the industrialized world standardized cup measures were relatively cheap and available. Scales were relatively bulky, expensive, and inaccurate in 1896. So the whole tradition got started, and most of the major cookbooks owed something to Fannie Farmer. Cookbooks that used standardized weights probably got started in other countries much later, when scales were becoming commonplace.