Across
- 3. Father of observational astronomy
- 10. Founder of Pythagoreanism
- 13. Founder of graph theory and topology
- 14. Inventor of dynamite
- 16. Investigator of spiral
- 17. Founder of lightning rod
- 18. Inventor of analytic geometry
- 19. Maroon 5's singer
- 20. World's greatest dramatist
Down
- 1. 35th US President
- 2. Invetor of calculus
- 4. Founder of Amazon
- 5. Theorist of evolution
- 6. Father of modern medicine
- 7. Founder of Lyceum
- 8. 46th US President
- 9. Founder of Western philosophy
- 11. Founder of Platonist School
- 12. Mr. Bean's actor
- 15. 44th US President