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  1. Nikola Tesla With Machine
  2. Heart anatomy, 19th Century illustration
  3. Native American Petroglyphs, Utah
  4. Nikola Tesla With An Early Tesla Coil
  5. Native American census roll, artwork
  6. Durer's Celestial Globe, 1515
  7. Louis Pasteur, French microbiologist
  8. Edwin Hubble, US astronomer
  9. 1649 Rene Descartes portrait philosopher
  10. Edison talking into his phonograph
  11. The Earth's seasons
  12. Muscles of lower leg
  13. Tibetan cosmology, 18th century artwork
  14. 1636 Galileo Galilei portrait astronomer
  15. Mayo Clinic, 1913
  16. Muscles of the foot
  17. Nose nerves and vessels, 1844 artwork
  18. John Knox, Scottish theologian
  19. Iliac blood vessel nerves, 1844 artwork