National Geographic : 1964 Oct
Start of a mighty swing promises a hit in a dock workers' lunch-hour game. During spring and summer, noon whistles signal pick up games in parks, dead-end streets, and even on rooftops. Flying feet and knuckles provide the weapons in ka rate, a murderous fighting technique that originated in China; its name means "empty hand." Utilizing cal lused knuckles, elbows, and edges of feet and hands, these students learn to split a one-inch-thick board with a lightning blow. Japanese law forbids the technique except as a supervised sport.