Sometimes, when we look around, it can seem that our world is worse off than it's ever been. But despite intractable problems, there is good news: Untold millions of people are living healthier, more productive and more secure lives than ever before.
I am 14 years old, it's the middle of the afternoon, and I'm curled into a ball at the bottom of the stairs. I've intended to drag my uncooperative limbs upstairs to my dark disaster of a bedroom and sleep until everything hurts a little less, but my body and brain have simply drained down. I crumple into a bony, frizzy-haired heap on the gold shag rug, convinced that the only thing I have left to offer the world is the removal of my ugly presence from it, but at that moment, I'm too exhausted to do anything about it.