1. Have you thoroughly read chapter 7?

2. Whose mathematical mysticism led to the downfall of Ionian science?

3. Which later scientist was strongly influenced and even hampered by the belief of the above man?

4. How did Huygens estimate the distance to a star?

5. Which group of people from Botswana call the Milky Way "the backbone of night"?

6. What did Carl Sagan learn about the sun when he first went to the public library?

7. Why does the clepsydra not fill when immersed in water with the neck covered?

8. Where did Carl Sgan grow up?

9. Write about quintessence in relation to the regular solids.

10. Who invented the word "atom" and what does it mean?