1. Have you thoroughly read chapter 13?

2. Sketch the L.F. Richardson diagram and briefly explain it.

3. Give one example of why Sagan thinks human nature is improving and we can make dramatic societal changes for the better.

4. Who was the last scientist to work at the Library of Alexandria, who was also killed during its destruction?

5. Sagan cites a study that says $___ are returned to the national economy for every dollar spent on the space program.

6. Where does Sagan believe the word "cosmopolitan" first realized its true meaning?

7. What did Count of La Pérouse do?

8. What harmful effect is there from releasing CFCs into the atmosphere?

9. What determines how good a scientific theory is?

10. Does Sagan give a feeling of hope or despair?