By the 1990s, [Richard Wiseman] had taken on an unconventional project—running experiments on self-proclaimed lucky and unlucky people and attempting to quantify their differences. “His research is hilarious,” says Carter. “He takes people who self-define as lucky and people who don’t say they’re lucky, and then he puts a $20 bill in the street and the lucky people notice them and pick them up. And unlucky people don’t.”
It's so simple, that it's hard to believe. But it certainly seems to fit: people who are observant and open to change are more likely to benefit in life.