> As was mentioned in a few comments in this thread, high-school textbooks in multiple countries are gradually dumbed down, so much that 20 or more years old textbooks are now considered a material for gifted kids. (I can confirm this.) Your turn.

And what do you think that proves exactly? Did you prove that the kids using the old textbooks actually absorbed the more advanced material? Did you prove that outcomes using the old material are better than with the new material?

Perhaps the new textbooks simply distilled the relevant material that the vast majority of kids actually grasp, without all the unnecessary detail that was just skipped over. I can think of plenty of different scenarios to explain the evidence that's been listed here, and only one of those explanations are "dumber kids and/or dumbed down education".

The exact same arguments have been trotted out about the dumbing down of liberal college education, where in the 1900s, every college degree meant exposure to poetry, art, history, philosophy and more. Modern college education is then portrayed as poor substitute, completely ignoring the fact that our body of knowledge is at least 10,000x larger than it was in the 1900s, and a direct comparison is frankly laughable.

> If the only problem is that humans are losing the ability to learn without playing computer games, perhaps we could fix it by making all the necessary games.

Talk about missing the point. As evidenced by my use of "for instance", that was merely an example. Even among adults, interactive systems are clearly more engaging, and given the environmental factors that shape modern kids, you obviously are already too old to grasp their thinking process if you can't understand that different environmental factors entails different learning processes.

Which just proves my point that adults are and always will be out of touch with the kids of their day.