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  1. Arterial supply and venous drainage of the organs.
  2. Albert Einstein, physicist
  3. Arterial embolism
  4. Carboniferous landscape
  5. Watch gears, SEM
  6. Abstract line pattern.
  7. Microscopic view of human antibodies with red blood cells
  8. Berliner helicopter, 1922
  9. Rear view of acupuncture model
  10. Crystal
  11. Star Trails Over The Devil's Golf Course In Death Valley
  12. 14th century theological cosmography
  13. Fehling's test for sugars
  14. Galen lecturing on anatomy in Rome
  15. Kidney glomeruli, SEM
  16. Right lung - medial view. respiratory system
  17. Mercury
  18. Fingerprint, computer artwork
  19. Pharmacology lab work
  20. Human Skull
  21. Cell
  22. Embryonic development
  23. Concentrating sunlight, 17th century
  24. Auditory ossicles of the middle ear. sensory organ
  25. Extinct dodo
  26. Fossil remains and skeletal reconstruction of Tianyulong confuciusi
  27. Noctis Labyrinthus, Mars
  28. Archaeopteryx
  29. Marie Curie
  30. The Man and the Alembic
  31. Meandering Mississippi - USGS Earth as Art
  32. Amateur astronomy, computer artwork
  33. Silver birch twig, SEM
  34. Caffeine crystals, SEM
  35. Alabama - USGS State Mosaic
  36. Skeleton Chart
  37. Heart And Lungs, Historical Illustration
  38. Venus
  39. Abstract line pattern.
  40. Various pollen grains
  41. Allosaurus dinosaur skeleton
  42. Conceptual image of salmonella
  43. Plant roots
  44. xDNA molecule
  45. Insulin Crystals, Light Micrograph
  46. Anterior view of human skull, with labels
  47. Microscopic view of immunoglobulin G antibodies
  48. Cross section image of human head