Not really, you just have to pick one thing and study it for your whole life. A mechanic that can take apart a car engine to it's nuts an bolts and reassemble it is just as intelligent but they focused their learning on mechanics.
In this instance, I have to beg to differ.
To become a neurosurgeon, you first have to:
Go through your standard undergraduate education (4 yrs with a focus on premed).
Get accepted into a Medical School (and complete 4 yrs of training).
Throughout the process, successfully take the USMLE Steps 1-3 (you need to do very well in this 3-part exam if you want to land a spot as a neurosurgery resident).
Assuming you get through med school and score very well in all 3 parts of the USMLE, then you get accepted into a neurosurgery residency (and that takes another 6 yrs of training).
After you complete your neurosurgery residency, you could then apply for a job at a major medical institution. If it were incredibly easy to get a job afterwards, everyone who applies would then land a dream job, but the reality is that sometimes these "new" neurosurgeons" have to "beef" up their resume by completing an added 1-2 yrs within a fellowship program in something like endovascular neurosurgery and interventional neuroradiology.
So, tally it up and
you have up to 16 yrs of training to become a neurosurgeon. Assuming you have the mental stamina, physical dexterity and sheer intelligence to do what it takes, then yes, it isn't that hard, but to compare it to a mechanic, that's a far cry. I'd say that the average person "in the know" would say that the comparison between a car mechanic and a neurosurgeon is not even in the same galaxy. Give a high school graduate one year at a trade school and they can be considered a car mechanic.
All that aside, then if you were to consider the ramifications involved in performing both roles, the car mechanic might possibly be unable to fix your car, which in the worse case scenario would require you to buy a new one. The neurosurgeon doesn't get many outs, because if he/she fails, most often the patient dies and if the patient dies, it could possibly cause them their reputation and ultimately their career and job.
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