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Idk if it's still around or not but Lego Mindstorms I think it was called was the gateway into my robotics interest as a kid.

Sadly, they discontinued Mindstorms a few years ago. Though, I'm sure you can still buy used/new kits from 3rd parties.

Oh no! That stuff was incredible, even for young kids.

Wow, too bad. I guess one can look at Bricklink to see what is available.