Book excerpt: Bestselling author Prakash Iyer uses simple but powerful anecdotes and parables from all over the world to demonstrate what makes for effective personal and professional leadership. Iyer draws lessons from sources as diverse as his driver, a mother giraffe, Abraham Lincoln and footballers in the United Kingdom. He shows how an instinct to lead can be acquired even while flipping burgers at a fast-food chain. All of these stories come together in an explosive cocktail to unleash your inner leader.