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It's incredibly intuitive. An adult soccer field is 1.8 acres and a foot is... the size of a man's foot. I can visualize this volume. Meanwhile, an acre foot is 1283 m^3. I don't have intuition for that volume measurement.

Also, "mainline hard-core pornography whenever you're ready!"

Magna-tiles are a big hit in our house. My kids and every kid we have over likes them. Better than legoes because they're more fragile, so they don't get locked up into projects for months.

We play red alert with custom games by creating ssh tunnels to a public server. Not strictly necessary, but easy to do with ssh.

Run time "code coverage" would give you that.

Compiling Qt with the right switches is hard enough, before you throw in cross compiling on top. Since you only need to compile a new Qt release once every few months, why optimize the process? Just kick it off and go to sleep. I don't modify core Qt libraries ever. If I was iterating on Qt itself, I would definitely figure out cross compiling. Anyways if you come up with such a working cross-compile recipe, you should post it some place.

Charts module is GPL, if you care about commercial usage. The core is LGPL which isn't too bad to comply with for commercial products.

Compiling qt on the pi is an overnight sort of thing. I think it took 12+ hours when I did it on a pi4. Thankfully, once it's compiled, you don't have to compile again until you next version bump.