Word: dryness
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Dates: during 1940-1949
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...Reason: Walter Sydney Adams, astute director of Mt. Wilson Observatory in California, said he had observed the Martian atmosphere for water-vapor content, found none or almost none-in any case (allowing for instrumental error) not more than 5% of the moisture in earth's air. In such dryness it seemed most unlikely that active animals could exist. In making his observations, Dr. Adams used "the most delicate spectroscope yet known...