What do Rosa Parks, Dale Carnegie, Albert Einstein, Steven Spielberg, Eleanor Roosevelt, J.K. Rowling, and Joe DiMaggio all have in common? Answer: They are all considered introverts. In fact, scientific research tells us that at least one in every three people is an introvert.

We often think of extroverts as the trailblazers: think of Oprah Winfrey, Winston Churchill, Martha Stewart, Muhammed Ali, and John F. Kennedy. However, the new book Quiet by Susan Cain tells us that the contributions of introverts have been equally important throughout history. Our world belongs to extroverts -- the prevailing culture of celebrity and social media in the US alone is a prime example. But there is an undercurrent that continuously pushes us forward through ideas and examples...quietly.

Susan Cain's book will appeal to those who crave the limelight as well as those who'd rather stay home and just read about it. As Gandhi, one of the famous introverts cited in the book, once said, "In a gentle way, you can shake the world."