The one about the "Luck Surface Area"
Spoiler! You make your own luck.
Recent read: Increasing Your Luck Surface Area.
The simple formula for "increasing your luck" is
L = D * T, where
D is doing and
T is telling.
The amount of serendipity that will occur in your life is directly proportional to the degree to which you do something you're passionate about combined with the total number of people to whom this is effectively communicated. In other words, you make your own luck.
When you pour energy into a passion, you develop an expertise and an expertise of any kind is valuable. But quite often that value can actually be magnified by the number people who are made aware of it. The reason is that when people become aware of your expertise, some percentage of them will take action to capture that value, but quite often it will be in a way you would never have predicted.