I came here to say this. It's important to realize the size of luck's effect on our lives, but the next step isn't just to shrug and say "oh well, I guess I wasn't lucky."

There are in fact scientifically proven ways to increase one's chance for getting lucky. I highly recommend Richard Wiseman's book "The Luck Factor" which goes into this research: http://www.richardwiseman.com/books/luckfactor.html