I have some fond memories that were rekindled recently thanks to a college course I'm currently taking.
When I was very small, like, pre-kindergarten, my family had this toy that was an interactive map of the Solar System. Pushing various buttons on the device made a little electronic voice state facts about the planets, their moons, their distances from the Sun, et cetera.
The electronic voice had some rather strange vocal mannerisms, and remembering the funny way that the voice would state the planetary facts helped me better commit them to memory. So I knew the four major moons of Jupiter - Ganymede, Callisto, Io, and Europa - because the toy listed them off with some weird inflections that I, as a very small child, thought were hilarious.
Flash forward and in my Cosmology course that I'm currently taking, the professor mentions the four major moons of Jupiter and requests that we commit them to memory. Oh honey, I memorized the major moons of Jupiter before I could even add or subtract numbers.
Sheer curiosity brought me to attempt to search for the toy on eBay - as it was likely the early 2000s when I played with it - and was actually successful in finding it (or something like it) just by typing in "talking educational solar system model":
Though I remember ours as being blue rather than dark gray, I do believe time has worn upon my memories of the toy and skewed them a bit. It had been so long I had forgotten exactly how the interactive interface looked - but looking at it now, memories are starting to trickle back in and they seem correct when compared with actual photographs of the toy.
The eBay listing I found (where I got the picture) says the toy is from 1999, which about makes sense for when I would have played with it. We likely got it for my brother, who was obsessed with anything related to outer space, and he would have been four and either entering or just about to enter kindergarten around the time this toy came out. I likely was allowed to play with it when I too reached four years of age, though it is also likely my parents let me play with it when I was even younger, but my memories from my preschool/pre-kinder years are very spotty.
Apparently the device came exclusively from the now defunct store KB Toys, according to a separate eBay listing where the toy is still in its box. It was manufactured by SNT Electronics, which my Googling is telling me is a company that, at least currently, mostly does video camera accessories and hard drives.