I had a Gilbert Erector Set when I was 8, used to assemble cranes, booms, etc. to lift play loads, etc. The furnished 120VAC motor drove a slide-gear transmission via wormgear, it would chew your finger off if you got it in the uncovered gearbox. Hard to believe I still have all my fingers.
Gilbert also made chemistry sets, my folks didn't get me one of those, probably a good thing. I've heard many stories of ruined rugs and carpets, burnt floors and stained clothing!
Every weekend I used to frequent warehouse sales between 1974 and 1985 in the Silicon Valley (Sunnyvale, Santa Clara, Cupertino, San Jose, Mountain View) that sold surplus parts from the local companies (National Semiconductor, Fairchild, Maxtor, Seagate, Shugart Associates, Western Digital, HP, Apple, IBM and too many others to mention or even recall)...it was a wonderland of mysterious, amazing and cheap components, pallets and boxes were filled with discrete components and PC parts.
Yes....good times.