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  1. Early electrical equipment
  2. Patent--Light Bulb
  3. Comparing the eight major planets on the same scale
  4. Microscopic view of coronavirus
  5. Arthritis of the neck, X-ray
  6. Bicycle diagram, 19th century
  7. External auditory canal of human ear (with labels)
  8. Monarch butterfly chrysalis about to hatch
  9. Human spine, side view
  10. Chrysocolla
  11. Muscles of the side and back
  12. Dental anatomy
  13. Soap bubbles on a dodecahedral frame
  14. Microscope
  15. Malachite
  16. Microphone
  17. Van Gogh from Space - USGS Earth as Art
  18. Earth
  19. Leonid meteor shower of 1833, artwork
  20. Close Ups Of Fortification On Crazy Lace Agate
  21. Female hormone
  22. Oil Pump Jacks On Canadian Prairie At Dusk, Carlyle, Saskatchewan, Canada
  23. Cross section of planet Earth showing the inner core
  24. 1832 Darwin's ship HMS Beagle plan
  25. High speed photograph of bullet leaving gun
  26. Cross-section of human heart. cardiovascular system
  27. Signal Hill Oil Derricks
  28. Northern celestial map
  29. 16th century world map
  30. Bogda Mountains - USGS Earth as Art
  31. Armillary sphere
  32. Respiratory Anatomy, 19th Century Artwork
  33. DNA
  34. Medical illustration of human leg muscles, four side views
  35. Conceptual image of neuron
  36. The Water Cycle
  37. Cardiac muscle, TEM
  38. A Phrenological Map Of The Human Brain. From Virtue's Household Physician, 1924
  39. Map showing the Local Arm in the Milky Way
  40. Conceptual image of mitosis
  41. Earth's magnetosphere, artwork
  42. CT scan of brain
  43. Earth Agate A
  44. Flying Machine, drawing by Leonardo da Vinci. Ca. 1488
  45. Wave energy
  46. Molecular model
  47. Solar system map from 1853
  48. American Frohse Anatomical Wallcharts, Plate II