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  1. E. coli bacteria, SEM
  2. Conceptual image of neuron
  3. Museum of Science and Industry Vehicles - Chicago, IL: Retro Travel Poster
  4. 16th century world map
  5. Tyrannosaurus rex dinosaur skull
  6. Conceptual image of mitosis
  7. 1951 space shuttle design
  8. Muscles of the abdominal wall - anterior view
  9. Lung tissue, TEM
  10. Jurassic life, artwork
  11. Body musculature
  12. Stacked Agate II
  13. Jurassic dinosaurs
  14. Leonid meteor shower of 1833, artwork
  15. Grey Agate B
  16. Sunflower - Botanical Illustration
  17. Pipette Dripping Liquid Into Test Tubes
  18. Caduceus, artwork
  19. The Saturday Evening Post, Do As Your Doctor Tells You
  20. Sir Isaac Newton
  21. Wire Your Home Window Display
  22. ECGs of a normal heart rate, artwork
  23. Southern celestial map
  24. Semiconservative DNA Replication
  25. Femur - anterior view. skeletal system
  26. Brain, artwork
  27. Cardiac muscle, TEM
  28. Apothecary
  29. Bracken rhizome, light micrograph
  30. Artwork showing Chicxulub impact crater, Yucatan
  31. Heart anatomy, 19th Century illustration
  32. Green Blue Optic fiber
  33. Medical illustration detailing thoracic outlet syndrome
  34. Armillary sphere
  35. Van Gogh from Space - USGS Earth as Art
  36. Lung cells, fluorescent micrograph
  37. Stethoscope
  38. Wave energy
  39. Computer hard disk assembly
  40. Antique pharmacy bottles
  41. Plant cell
  42. Wilson Dam, Flood Gates
  43. Bees
  44. Depiction of different phases of the Moon by Galileo Galilei
  45. DNA molecule, artwork
  46. Embryo development 24-36 hours after fertilization
  47. Normal hip, X-ray
  48. Virus particles entering cells, artwork