Who Invented What?

123456789
Across
  1. 1. Who invented school?
  2. 4. who invented pianos?
  3. 6. who invented music?
  4. 8. who invented the pencil?
  5. 9. who invented guitars?
Down
  1. 2. who invented books?
  2. 3. who invented multiplication?
  3. 4. who invented 0?
  4. 5. who invented homework?
  5. 7. who invented infinity?