We can all be heroes. That’s the inspiring message of this New York Times Bestselling picture book biography series from historian and author Brad Meltzer.     Even when he was a kid, Albert Einstein did things his own way. He thought in pictures instead of words, and his special way of thinking helped him understand big ideas like the structure of music and why a compass always points north. Those ideas made him want to keep figuring out the secrets of the universe. Other people thought he was just a dreamer, but because of his curiosity, Einstein grew up to be one of the greatest scientists the world has ever known.       What makes a hero? This lively, fun biography series by best-selling author Brad Meltzer answers the question, one great role model at a time.