There ought to be something similar for calculus too. While a detailed and formal treatment of the subject can be delayed till the age at which it's introduced now, I feel that the intuition and feel for calculus can be formed more efficiently at an earlier age.

If nothing else, it may help them understand where to seek solutions for the common problems they encounter. I started learning Electronics at a fairly young age using undergraduate level textbooks that I found lying around. The need for and relationships between concepts in calculus, logarithms and trigonometry were a recurrent problem for me.

PS: If anybody is wondering, those books were from an earlier generation engineer. They were very interesting, to say the least. All the circuits (amplifiers, rectifiers, oscillators, multivibrators, mixers, various RF Txr and Rxr designs, etc) were using vacuum tubes! Diodes, triodes, pentodes, thyratrons, magnetrons, TWTs, etc were used liberally in them. It had a description of an early form of the Instrumental Landing System (ILS). There were also descriptions of some early generation semiconductor devices and their similarity to vacuum tubes. I don't think ICs were in much use back then, because the book had no mentions about them.

I used to spend hours at a time with those books when I was a child. Later I graduated in Electronics engineering and went on to work on the avionics for a satellite launcher. Vacuum tubes were museum pieces by the time I was born. But I was the only one in my undergraduate class who had seen or knew anything about vacuum tubes, when we had lessons on CRTs, magnetrons, etc. I can't stress how deeply those books influenced my education and career. Sweet memories!

In the 80s and 90s, RadioShack also had an impressive kit collection. Just realizing it was to get kids “hooked”.

Elenco continues to sell one of the kits that I used to have, less RadioShack branding.