"Chlorine is a deadly poison gas employed on……" — Carl Sagan

"Chlorine is a deadly poison gas employed on European battlefields in World War I. Sodium is a corrosive metal which burns upon contact with water. Together they make a placid and unpoisonous material, table salt. Why each of these substances has the properties it does is a subject called chemistry."

Carl Sagan

467 Quotes by Carl Sagan

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