Nassim Taleb's "The Black Swan" is that rare book that can change the course of one's life, and, if enough people use its insights, the course of history.
Summaries are inadequate--one needs to study the book, as the shifts in thinking the author shows us how to make are so great, we need to invest time and attention. Stick with it despite the resistance that deeply ingrained ways may raise (even unconsciously) against it.
This is the only book I've ever found that prepared me to deal with uncertainty, and the future.
Check out his website:
In the book, he warned years ago that our current banking system could lead to worldwide financial problems, and he quotes that on passage on the site.