I live in western Canada, a pair of long johns, jeans and a coat are enough to spend an hour in -25 °C. I own a few things that I don't mind getting rid of when I move like a snowboard and a mattress, otherwise my clothes + toiletries + laptop/phone is it.
I remember seeing a study that showed that people who take notes on paper do better vs people who take notes on a laptop. People who didn't take notes(or take very few) weren't mentioned.
You're correct that most new studies compare handwritten vs. laptop notes. The effect of handwritten notes vs. no notes was studied quite a bit earlier, and I believe this effect is now as uncontroversial as psychology can be.
A good review of the literature (from 1989) is found here:
I don't have anything large at hand that I can share. Here is a small real-world use case https://code2flow.com/wclEvF - and this is another https://code2flow.com/KdNVeJ
In the latter example, please note that "Update failed: flash error" generates only one node in the flowchart.
The most complex flowcharts were created by customers and testers but I don't want to expose their data. They have hundreds of lines of code resulting in huge diagrams.
The problem with the authors principles is that they are based on a study[0] that has failed to replicate and was faulty to begin with[1].
[0] Susanne M. Jaeggi, M. B. (2008). Improving Fluid intelligence With Training on Working Memory. Proceedings of the National Academy of Sciences. doi: 10.1073/pnas.0801268105
I'm trying to address the issue without relying on how well given studies replicated, since that's a bit of a minefield in general. A lot of the principles in the parent are much older than the studies. While it would be really great to have solid studies that would confirm one or the other position, it doesn't seem like they exist, so I'm addressing it on a more philosophical level.
If the study result cannot be replicated then the "principles" you refer to are nothing more than superstitions and you can "address them on philosophical level" all you want, that won't make them any more true.
The fact that those things (like challenging yourself, seeking novelty, etc.) are often quoted in context of IQ increase just comes from observing the behaviour of highly intelligent people and then confusing the cause with effect.
