How can a three-pound mass of jelly that you can hold in your palm imagine angels, contemplate the meaning of infinity, and even question its own place in the cosmos? Especially awe-inspiring is the fact that any single brain, including yours, is made up of atoms that were forged in the hearts of countless, far-flung stars billions of years ago. . . . These atoms now form a conglomerate — your brain — that can not only ponder the very stars that gave it birth but can also think about its own ability to think and wonder about its own ability to wonder.