Some of the most well-known businesses you can think of started as partnerships between two men--Hewlett Packard, Ben & Jerry, Harley Davidson, even Batman and Robin. When I found the book "Power through Partnership." How Women Lead Better Together," co-authored by Maggie Chotas and Betsy Polk, I was intrigued--what does it take for two women to run a successful business together, and are two heads really better than one?