So, around 50 out of
7 BILLION, that's a pretty large ratio...
Some say "a little knowledge is dangerous"; IMO, that depends on who possesses said knowledge & how they use it; some have a little knowledge & think they know everything on the subject, others have a little knowledge &
yearn for more before they use it...
The other thing I wish to add is "necessity is the mother of invention"; you would be amazed what 3rd world citizens can achieve when they
need to; in most of these cases, a little knowledge is
never dangerous...
You see my point, though, the large majority don't even know how to
check the oil level in their car, much less how to
add oil; they would have
no chance of assembling a vehicle...
However, that's a relatively new situation; half a century ago, mechanics only existed to do the jobs people didn't
want to do themselves or simply didn't have the facilities to perform; the "average joe" did most of his/her own vehicle maintenance him/herself...
Have any of you seen
mighty car mods? Two guys with university degrees, one of which has a music contract (all the music for the series is written by him (Moog)) but they both love working with cars, sort of like "roadkill"; what started as a joke has become a worldwide sensation, two self confessed "hacks" doing some weird & wonderful things with cars that the average joe can learn from; personally, I think the world need more guys like these...