My father was not only a planetary scientist and a great popularizer of science, but he thought very deeply about the world. He was a scholar, he studied history. He taught a class in critical thinking, and he was very, very aware of the directions we might go.

Nick Sagan

About Aware Class Critical Critical Thinking Deeply Directions Father Go Great He History Might Only Planetary Scholar Science Scientist Studied Taught Thinking Thought Very World

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