The three experiments have been extensively tested using terrestrial soil samples and, as a result, it is safe to say that it is extremely unlikely that a false positive result will be obtained.
The word "positive" translates as evidence of life processes in this summary by Harold Klein, biology team leader of the Viking mission, published about the time that the first U.S. lander went to work on the surface of Mars. Yet last November, after these same life-seeking experiments aboard both the Viking landers had shown apparently positive results in tests of Martian...
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