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  1. Indigo Agate D
  2. X-ray view of human foot
  3. Purple Watercolor Agate I
  4. Scientist working in laboratory
  5. The human skeleton and muscular system, front view
  6. Tentative phylogenetic scheme for hominid species
  7. Bright Periodic Table - Black, Modern Text
  8. Evolution of life, artwork
  9. Female muscles, artwork
  10. Heart and lungs, historical illustration
  11. Three stages of periodontal disease
  12. Molecular graphic of a molecule of water
  13. Blood clot, SEM
  14. Human teeth structure with labels
  15. Florida - USGS State Mosaic
  16. Partial solar eclipse, January 2011
  17. Human blood cells, SEM
  18. Brain anatomy
  19. Conceptual image of synapse of neuron inside brain
  20. Daimler automobile, 19th century
  21. Circuits
  22. Moss Agate
  23. Anatomy of human body and circulatory system, front view
  24. The Moon
  25. Brass astrolabe from the middle ages
  26. Elastic artery cross-section, SEM
  27. Algerian Sahara - USGS Earth as Art
  28. Physician and Patient
  29. Dione and ring shadows on Saturn, Cassini
  30. Wood. Scanning electron microscope (SEM)
  31. E=mc2 in blue
  32. The cervical vertebrae
  33. Metal hydroxides
  34. The vertebral column
  35. Earth's magnetic field protection
  36. Blood spectra, 19th century artwork
  37. DNA
  38. Root canal therapy
  39. Medical chart showing the signs and symptoms of sciatica
  40. Lung anatomy, artwork
  41. Faded Blueprint Stethoscope Patent Poster
  42. CT scan of brain
  43. Synapses, artwork
  44. Human nervous system, artwork
  45. Human tooth anatomy, diagram
  46. Vintage Parchment Ophthalmoscope Patent
  47. Foot bones
  48. Johnniac computer