jbotz

Your criticism is poorly informed. Math Academy is definitely not a "Duolingo-for-Math". As a platform it's far from perfect, but as a program it's a serious and complete secondary school to undergraduate university math program, with excellent explanations, reinforced by well-thought out exercises. It's definitely competitive with the top-rated math textbooks in each of the areas it covers.

As for the OP "not taking a day off"... for some of us ritualization is productive because it's what we need to stick with a difficult program. Maybe for you that's not the case. To each his own.

(I have my own criticisms of Math Academy: The platform should be more flexible in pacing and allow repeating sections. It should have built-in spaced-repetition features. And the company is uncommunicative and aloof. I'd be willing to overlook most of these faults at a lower price-tag, but for what they charge it really rubs me the wrong way.)

Judgemental much?

GP's first sentence isn't arrogant (at worst displaying a bit of false humility) because it's saying everyone but him doesn't know about a thing he did. Your second quote you apparently mis-parsed because of a minor English error (he should have said "to Python" rather than "in Python"), but to me it was pretty clear what he meant.

Apple killed the iPhone mini because it only had a 4-6% share of sales of all iPhone models. While some people may really want this, I can't imaging that it'll get more than 5% of iPhone sales (after maybe an initial higher novelty peak).

Apples, oranges. Those Devialet look interesting, but aren't "open ear" (they're plugs) and cost twice as much. edit: almost four times as much.

We're actually heating the earth in two ways... one is by increasing the greenhouse gases in the atmosphere. The other is simply by using energy; any use of energy means moving something to higher entropy and thus producing heat, even if that energy comes from 100% clean or renewable sources. However, nobody talks about this second way of heating the earth because it's about two orders of magnitude behind the first, i.e. for now pretty insignificant.

As for making the earth less reflective with PV panels... yes, you are right and most of that absorbed solar energy directly contributes to heating the earth because PV panels aren't anywhere near 100% efficient in converting it to electricity, but even the part that is converted to electricity will become heat again in the end, like when it powers AI data centers. (If PV was 100% efficient, then the lack of reflection wouldn't directly do any heating, the heating would all happen when the electricity is used.)

For now that isn't a big concern because the greenhouse gases our civilization is releasing into the atmosphere do so much more heating than all our use of energy, but if we do become 100% renewable and survive that particular danger, then by Jevons' paradox we'll soon be using 10x to 100x more "clean" energy and be heating the earth all the same again.

We've done similar things probably since before we were even homo sapiens... or at least as long as we've had control of fire. Setting fire to large areas in order to drive a herd of mammoths of a cliff, for example. Convenient, and much safer than poking angry mammoths with sharpened sticks.