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  1. Alternating Motor - Blue
  2. Artwork of tooth showing periodontal disease
  3. Pouring liquid into beaker
  4. Jupiter, 1880
  5. Small intestine villi, section
  6. Tennessee - USGS State Mosaic
  7. Valley And Mountain Breezes
  8. Pipes at Nesjavellir Geothermal Power Plant, Iceland
  9. DNA molecule
  10. Bellis and Morcom steam engine
  11. HIV virus particles, artwork
  12. Cardiac muscle, SEM
  13. To Polish The Sun
  14. Distillation, 16th century woodcut
  15. Circuit board components
  16. Internal brain anatomy, artwork
  17. Front and side views of pelvis in chimpanzee, Australopithecus, and modern human
  18. Long Island Railroad Communication Lines
  19. Ammonites
  20. 5s electron orbital
  21. The human body with superimposed colored plates by Julien Bougle
  22. Study of the Human Figure, Anterior View
  23. Spinal cord anatomy, 1844 artwork
  24. Printed circuit board
  25. Conceptual image of platelets with red blood cells
  26. Yeast protein interaction map
  27. Herbal pharmacy
  28. Muscles used in cycling, 19th century
  29. Wilson Dam, Alabama, forms portion of the Tennessee River barge route
  30. Close-Up Of Fortification Laguna Agate
  31. Diphtheria treatment, artwork
  32. Early electric lamps
  33. Allosaurus dinosaur skeleton
  34. Chain Of Molecules
  35. Magnetic field
  36. 19th Century internal combustion engine
  37. Normal hip, X-ray
  38. Comparing Saurischian and Ornithischian Pelvises
  39. Brain anatomy, 16th century diagram
  40. Blood analysis
  41. Venus, High Resolution Gravity Data
  42. Explorer 1
  43. Inner ear
  44. An Allosaurus Stalking A Herd Of Camarasaurus Dinosaurs Grazing At The Water's Edge
  45. Guitar string vibrating
  46. Abdominal organs in situ. abdominal cavity, digestive system
  47. Arthritis of the hip, X-ray
  48. The human body with superimposed colored plates by Julien Bougle