What Quality Do The Most Successful People Share? True Grit

What makes a person successful? For Professor Angela Duckworth, the answer
is grit, an intangible trait that motivates passion and perseverance. In a
study at West Point, Duckworth found that grit mattered more for success
than leadership ability, intelligence and physical fitness. Now, she hopes
to introduce grit to classrooms across the country. Economics correspondent
Paul Solman reports.