Might be a cool Xmas present...By Daniel GolemanWhy It's a Must-Read" Despite the popular mystique of grades and scores of scholastic aptitude and IQ tests, it's an "open secret" that those grades and scores cannot unerringly predict who will succeed as a leader. At best, says author Daniel Goleman, IQ contributes perhaps 20% to the factors which determine leadership success -- leaving 80% to