Time: July, 2010 at around 9-10 PM Location: Chengdu, Sichuan, China When I was around ten, one summer night, I was waiting outside a swimming facility for my friend to get dressed so we could head home. It was a bright night with scattered clouds. When I looked up, I saw a giant black triangle above the clouds—slightly longer and narrower than an equilateral triangle. I remember only thinking to myself how huge the triangular shadow was, easily the size of a football field. At the time, thou...