HN discussion of interesting technology demos for fifth graders: https://news.ycombinator.com/item?id=20069714
One popular suggestion was browser tools, showing how web sites can be modified.
Another great idea is showing screenshots of bugs in realistic games and how they can go wrong.
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My 3.5yo is learning to use a mouse, and it's super interesting.
He's mastered clicks and drags, but he hasn't yet figured out lifting up the mouse when run out of mouse pad. That's a tricky case where you deliberately break the relationship between mouse and cursor movement.
Futhark's design is deliberately trying to stay simple to keep long term design sustainable.
The author also has an interesting discussion of relative versus absolute paths in import syntax, and how relative paths can make local analysis easier.
Terminad is a really interesting approach to rendering markdown in the CLI. It deliberately doesn't render links, so you can always see both the link text and the URL.
In a browser you have hover to see URLs, but not necessarily in a terminal.