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Across
  1. 3. American inventor known for the phonograph and light bulb
  2. 4. A major political scandal in the US during the 1970s
  3. 5. NASA's ill-fated lunar mission in April 1970
  4. 9. French mathematician known for his work in algebra
  5. 11. Renaissance astronomer who proposed a heliocentric model
  6. 12. Agreement ending hostilities in World War I
  7. 13. Ancient Greek philosopher known for his cynicism
  8. 16. A hermit or recluse
  9. 17. Ancient Greek mathematician known as the father of geometry
  10. 18. Infamous ship that sank in April 1912
Down
  1. 1. Ancient Greek mathematician and inventor
  2. 2. The purchase of the Louisiana territory from France in 1803
  3. 5. Ancient Greek philosopher and scientist
  4. 6. Medieval philosopher and theologian
  5. 7. French philosopher and mathematician
  6. 8. German mathematician known for his contributions to number theory
  7. 10. The American war between the North and South
  8. 14. A significant change in political power or organizational structures
  9. 15. A space shuttle disaster in 2003
  10. 17. Physicist who published the theory of relativity in the spring of 1905