Are you an introvert, an extrovert or an ambivert? If you said introvert, you're not alone. Up to 50% of the population has introverted tendencies, but the problem is they're not being served by the world around them. In her TED Talk, author Susan Cain explains, schools and workplaces are designed to support extroverts and their need for stimulation — not those who thrive in solitude — and lays out her vision for a world where there's space for both to thrive.