[waster]

Agreed (smart person = smart no matter the activity), though that doesn't necessarily mean they will succeed at any given activity. I am always struck more by the connections that smart people make: The _really_ smart people often have this broad, even vast set of knowledge across many domains and can make connections across them that permit leaps of understanding that less smart people have a hard time following. Ironically, the really smart people are themselves struck by just how much they don't know.

To take an example, with a caveat because I'm only a small way in, _The Book of Martial Power_ by Steven J. Perlman looks at the underlying factors that make all martial arts function. He starts by identifying core principles they all have in common, no mean feat for martial arts ranging from tai chi to boxing and kung fu. He recognizes common elements, and does such a good job at reducing them to their core essence that it allows the reader to recognize how these could then apply to yet broader fields than martial arts, much the way people have both amusingly and annoyingly published books aplenty on _The Art of [Field Noun]_.

Could a persistent and only mildly smart person make these connections and recognize the commonality? I don't know. Maybe substantial persistence would allow someone to make huge progress, but I'm talking about mild smartness, not Einstein smartness. (Note that Einstein didn't self-identify as being brilliant, but did as being persistent. I'm not convinced about lack of brilliance, but he certainly was persistent. I'm also not sure I believe the estimates that his IQ was around 160, but that's the subject for many other conversations.)

Anyway, I think your (0xFFC's) point about being good at multiple fields doesn't conflict with this; in fact it is the recognition of the patterns across fields that allows smart people to be good at more than one/many fields.

[0xFFC]

Exactly. I have came to this conclusion thinking by myself. I do agree with what you said based on my personal analysis.

essence is :

"the patterns across fields that allows smart people to be good at more than one/many fields"