Anti-fog agents were developed by NASA during the Project Gemini, for use on helmet visors.During Gemini 9A, in June 1966, Astronaut Eugene A. Cernan tested NASA's first space suit, and discovered during the space walk that his helmet visor fogged, among other issues. [2] Cernan's suit was tested using the Spacecraft 9 life support system after the flight, when it was discovered that a small ... More @Wikipedia
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