1986: In Speaker for the Dead by Orson Scott Card, the human xenobiologists and xenologers, biologists and anthropologists observing alien life, are forbidden from giving the native species, the Pequeninos, any technology or information. When one of the xenobiologists is killed in an alien ceremony, they are forbidden to mention it. This happens again until Ender Wiggin, the main character of Ender's Game, explains to the Pequeninos that humans cannot partake in the ceremony because it kills them.