[fosco]

he was corresponding with another physicist, I do not think enough people realize no one is an island. Working, talking and communicating with others is how many things are learned and solidified because others force us to sharpen our thoughts by questioning them.

I think this is why some of the 'big' thinkers (see feynman einstein) worked at universities, it forced them to continue sharpening their skills because they had a collection of students questioning their ideas. I believe this applies to all fields... not just physics

my two cents. I agree with PaulPauper, I think it is zero as well.