[Jerrrry]

My 7 y.o. can explain a motor but we haven't tried building one, I was eyeing him sets online and was between a few. I built him a loop in MineCraft redstone to power his randomly-timed spooky lights in his "the backrooms" (SCP), but I don't know how to use the newer redstone stuff and haven't found a (educational) use-case to built him anything with the redstone torch/NOT logic gate etc.

[nathan_douglas]

My thirteen-year-old got tangled up in his dress shirt the other day.

[Dove]

Mine started with homopolar motors! They're fun and easy and great kid-level physics and engineering.

I can also recommend Snap Circuits for Christmas. :)