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