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  1. Salmonella, TEM
  2. Stethoscope
  3. Chest Anatomy, 19th Century Illustration
  4. Microscopic view of Penicillium expansum
  5. Surgeon in operating room
  6. Feather vane, light micrograph
  7. E. coli bacteria
  8. Anaerobiospirillum thomasii flagella, TEM
  9. Illustration of rods and cones in the retina
  10. Refraction
  11. Digestive system, artwork
  12. Prescription
  13. Nuclear fusion reactions
  14. Magnetic field of a solenoid
  15. Viral dUTPase enzyme, molecular model
  16. Orlan spacesuit gloves
  17. Tourmaline
  18. Studio shot of hand holding test tube with liquid
  19. Blastocyst implantation, diagram
  20. Metal compound solutions
  21. Row of spectrophotometer cells
  22. Fire plumes, computer simulation
  23. Artist's impression of Tyrannosaurus rex
  24. Interior of human blood vessel showing a thrombus
  25. Skull anatomy
  26. Molecular properties of different liquids
  27. Museum Wormianum, historical engraving
  28. Mouse tongue, SEM
  29. Antibiotic cell membrane effect, artwork
  30. Artwork of heartburn (acid indigestion) in stomach
  31. Neolithic hunters
  32. Embryonic development
  33. Microscopic view of white blood cells inside blood vessel
  34. Hand anatomy, artwork
  35. Marburg virus, TEM
  36. Robot picking bacteria containing human DNA
  37. 19th-century mining machine
  38. Practical Wireless, November 1958
  39. Robot arm picks tray of DNA-containing bacteria
  40. Stem cell research
  41. Liesegang patterns
  42. Vintage Advertisement For Renne's Pain Killing Magic Oil, With Decorative Border
  43. Nerve cell, computer artwork
  44. Artwork of microstructure of human bone
  45. Retina of a normal eye
  46. Craniofacial surgery approaches
  47. Early escalator, 1894
  48. Grass stem, SEM