> the oxygen in the room might be depleted enough from rebreathing to matter.

You have to be sucking air down at a truly prodigious rate to noticeably deplete the oxygen levels of a modern mechanically ventilated room

Dyspnea, like pain, is one of those conditions with a massive psychiatric component.

I've had patients who had a blood oxygen level of 97% who never the less needed to be put on a morphine and midazolam drip to keep the dyspnea at bay, and I've also had patients who are down to 80% and feels perfectly fine on room air.

Also, know the categories of opinions:

Editorials: opinion of the newspaper's establishment/editorial board itself (for example, the NYT's endorsement of person X for president will be published as an editorial). It may or may not have anything to do with the opinion of the owners/shareholders of the paper depending on the level of journalistic independence each publication can maintain.

Op-ed (opposite the editorials): opinions of people unaffiliated with the paper, but who were actively solicited by the newspaper to write (as salaried regular columnists or one off pieces). Which again, may or may not agree with the paper's "official line" depending on the level of dissent each editorial board tolerate or on the requirements by "fair time" laws.

Letters to the Editor: unsolicited opinions (generally from readers)--which are still nevertheless curated by the editors, you are are still unlikely to see the full range of opinions "in the wild."

Semi related are Advertorials: Which are paid advertisements dressed up to to look like an op-ed or a standard news piece. These only express the opinion of whomever bought the space.

I mean, the difference here is they are comparing people with considerable schooling with people who has even more schooling (high school dropouts vs college students).

I am talking about people who are entirely unschooled or nearly so (of which there were many back in the World War I era).

> AGCT

Hasn't it been shown many times that the AGCT is a complete bullshit way to measure innate intelligence because most of the questions revolve around trivia and school knowledge--which meant that rural men and African Americans of the era were classified as borderline mentally handicapped when they were simply unschooled.

It's not so much that everyone got smarter as we've managed to eradicate an extremely serious cause for profound mental retardation (congenital hypothyroidism).