I'm feeling a bit dated here. While I had only a few of them, I always thought them to be so cool. My parents started me on Lego (Thank You Mom and Dad) so that was my youth (forever young). The micronauts had a lot of interchangabilty with them but lego was expensive enough. Then Star Wars came out, price seemed to not matter as much anymore. If you're interested,
The Micronauts Homepage has a history of them, kinda cool. Hey, micro-nauts....midi-chlorians, could there be a connection? (Hypothetical rhetorical query posed to associate subject matter so as to not stray off theme too much)