Which of these was developed by nasa as a way to keep astronauts from overheating on a spacewalk and is now used by professional and collegiate teams to reduce the number of heat-related injuries? ear thermometer nanotube temperature pill

Nano-tubes are 10,000 times smaller than human hair and can sometimes be used as electronic insulators or conductors depending on the material, in a human spacesuit, water flows through these tubes in order to keep the astronaut cool during a space walk. The answer is c.