The book itself was super interesting to read by itself but the best part was that it came with a separate box with maybe 10-20 different experiments that the book would then guide you in doing.
For example, there was a tiny electric motor and you would hook it up to a little solar panel they provided and do something cool with it. Or you would have a little chemistry testing strip that would turn a different color if you put it in milk or if you put it in lemon juice to show ph levels.
Does anything like this still exist? I would love to buy something similar for one of my friends kids as a birthday gift.
I too was shopping for the same a couple decades ago for the same reason and had noted advertising in an unrelated magazine for Scientific American which was offering starter kits iirc. I landed on something else more practical instead.
Try https://www.scientificsonline.com/shop/science-kits?Page=1