1. One of the two is supposed to have a bladder made out of steel.
2. About 200,000 bucks
3. A Neurosurgeon knows nothing but does everything.
A Neurologist knows every thing but does nothing.
Seriously, to put it very simple, a Neurologists works up a patient for neurological deficits and take care of them in the chronic and acute state. Neurosurgeons basically performs the surgeries to correct the deficits that are surgically correctable and follow up on their job.