`Viking's Mars-life experiments were 66% positive'

 "By criteria established before launch, two of the three Viking microbiology
  experiments seem to have yielded positive results.

  First, when Martian soil was mixed with a sterile organic soup from Earth,
  something in the soil chemically broke down the soup - almost as if there
  were respiring microbes metabolizing a food package from Earth.

  Second, when gases from Earth were introduced into the Martian soil sample,
  the gases became chemically combined with the soil - almost as if there
  were photosynthesizing microbes, generating organic matter from atmospheric
  gases.

  Positive results in Martian microbiology were achieved in seven different
  samplings in two locales on Mars separated by 5,000 kilometers.

  p. 147 "Cosmos" - Carl Sagan


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