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  1. Nikola Tesla With Machine
  2. Heart anatomy, 19th Century illustration
  3. Nikola Tesla With An Early Tesla Coil
  4. Native American Petroglyphs, Utah
  5. Native American census roll, artwork
  6. Louis Pasteur, French microbiologist
  7. Edwin Hubble, US astronomer
  8. 1649 Rene Descartes portrait philosopher
  9. Durer's Celestial Globe, 1515
  10. Edison talking into his phonograph
  11. The Earth's seasons
  12. Tibetan cosmology, 18th century artwork
  13. Muscles of lower leg
  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