Average adult will spend 34 years of their life staring at screens

Because then there's a hope that they'll actually learn the underlying principle and make similar decisions in situations where someone else is not directly in control of their behavior.

There are kids who don't get to eat ice cream before dinner at home because that's the rule, who will happily do so when over at someone else's house without their parents around to enforce that rule. Then there are kids who actually understand why they shouldn't eat ice cream before dinner, who will decline to do so even if they have the opportunity. (That doesn't mean they'll exercise perfect judgment every time, but then, there's also no guarantee they'll follow rules that aren't being enforced.)

It's important to develop the critical thinking skills to filter out "junk food" content.

(To clarify: I'm not talking about children too young to understand the concept, I'm talking about children more than old enough to make such decisions in an informed way. Roughly speaking, think 12, not 3.)

> access to almost all of the world's knowledge for free

I'd guess we've got access to ~10% of it (but it's a good 10%!) for free, ~30% paid (but usually piratable!), and the remainder unavailable as a paid electronic resource but maybe (often not) as a paid paper one and maybe (often not) available pirated—maybe you can at least locate or learn of its existence with the Web, but possibly it's totally unknown to the Web outside of maybe a reference in some books that happen to be digitized (this does actually happen, though you do usually have to get a little obscure before it does, but sometimes not as obscure as one might think).

[EDIT] to be clear I think the Web is an excellent research tool, however an awful lot of its value in that role is from piracy (saving me, say, having to inter-library-loan or buy a book just to find the books that book name-drops in its preface, or to read one relevant chapter, or to see the book's index so I can find out whether I need it in the first place). I think its containing anything like "all the world's knowledge", even for liberal values of "all", is far from true, and there's a risk of thinking if something exists it's probably available as a digital resource delivered over the Web (far from true), and if it doesn't then surely it's at least possible to find out about its existence on the Web (also not true), and if neither of those are true it must be something of no value whatsoever to anyone or wildly obscure (not true).

[EDIT EDIT] then even if it is on the web, it can be really hard to find something that's not on one of a few major sites using search. More so than it used to be. It can take so damn long that pirating and reading a book on the topic on Libgen can be faster than finding the same info on the open web, even if it's there, which is pretty damning of the state of web indexing. As I wrote in another comment on this thread, it was once possible to be fairly sure when one had reached the edge of Google's knowledge and the thing you're looking for was not in its index—such certainty is now almost impossible, mostly because of how Google search (and seemingly all other web search tools) has changed, not because of increased total content.

Sunlight, however, is a wild mix of broadband EM emissions across basically the whole spectrum, as you‘d expect from a glowing ball of plasma (halogen bulbs are actually similar in that regard, they need and do have a UV filter). About a third of the sun’s emitted energy hits the earth’s surface as near infrared light, and then there is UV etc.

Near infrared light is very beneficial, the mitochondria in our cells can increase their energy output as a direct consequence of receiving photons in that frequency range. There are lots of studies that showed improvement of many health conditions following near infrared or red light therapy. I wouldn’t be surprised if NIR light helped prevent myopia too.

Given he's happy I'm not rocking that boat.