Four leadership myths.

1. "Leaders are born, not made." Research: 30% heritable, 70% learnable.
2. "Leaders need to be extroverts." Quiet leaders often outperform loud ones in complex situations.
3. "Leaders always have the answer." The best leaders say "I don't know" often; it builds trust.
4. "Leaders make all the decisions." Great leaders move decisions to where the information is.