Susan Cain says she usually speaks quietly, but her 2012 book Quiet came in loud and clear to fellow introverts all over the world.
It led to the creation of the company Quiet Revolution, dedicated to helping introverts share their talents and power with the world.
And now there's a sequel for younger introverts: The book Quiet Power, aimed especially at kids and teens. Susan Cain shares details of her life since the first book, and highlights of the new one.