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  1. Blood cells in blood vessel, artwork
  2. Anatomy of the bronchus and bronchial tubes
  3. Mitosis
  4. Mars map from 1881
  5. Stethoscope
  6. Heart And Lungs, Historical Illustration
  7. Rainhill Trials steam trains, 1829
  8. Comparison of healthy gums versus gingivitis
  9. Underwater earthquake and tsunami
  10. Rosalind Franklin, British chemist
  11. Pipetting
  12. Front and side views of pelvis in chimpanzee, Australopithecus, and modern human
  13. X-ray of a chest cavity
  14. Small intestine villi, section
  15. Antique laudanum bottle
  16. The Pharmacist
  17. Molecule Estrogene
  18. Molecule Testosterone
  19. Laboratory Equipments
  20. Anatomy of human face and neck muscles, front view
  21. Streamer chamber photo of pi-mu-e decay
  22. Paisley Agate
  23. The New Photography Or X Ray Photography From The Modern Cyclopedia Vol VI 1903
  24. Microscopic view of multiple nerve cells, known as neurons
  25. Concentrating sunlight, 17th century
  26. Citric acid crystals magnified 100x
  27. Testosterone hormone
  28. Pond life
  29. CDF particle detector, Fermilab
  30. Wernher von Braun, German rocket designer
  31. Sagenite On Mexican Agate
  32. Patent--Hot Air Balloon
  33. Paracelsus and the Basel tribunal
  34. Caribbean Luxury - USGS Earth as Art
  35. Himalayas - USGS Earth as Art
  36. Costellazioni II
  37. Nerve cell, artwork
  38. Ammonites
  39. Velociraptor
  40. Conversion
  41. Copper sulphate and magnesium sulphate
  42. Mining drill core sample with gold content
  43. A Relative
  44. Dentistry equipment
  45. 19th Century electrical equipment
  46. Walnut tree trunk
  47. Medical zodiac, 15th century diagram
  48. Normal wrist, X-ray.