Someone call Chicken Little and tell him to stay inside. No, the sky itself isn’t falling, but if knives are dropping through the atmosphere like rain drops, none of us can be too careful. Just ask Xiao Yunzhi of Guangyuan, China, who took a 5” knife to the side of the head while walking down the street. Apparently, the knife was being kept in a flowerpot on the balcony of a nearby high-rise apartment and was blown into the freefall that was eventually broken by Xiao’s head by a gust of wind. If that sounds crazy, brace yourself for this...