Every morning, you wake up and face the world. What does it look like to you? Do you see a paradise of endless opportunities, where people are friendly and helpful? Or a world filled with injustice, where people cannot be trusted? In the final installment of this year's You 2.0 series, we talk with psychologist Jamil Zaki about how we become disillusioned and distrustful of the world, and how to balance realism with hope.