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  1. Interior of human blood vessel showing a thrombus
  2. Water clock, design from 1646
  3. Heart and lung anatomy, 17th century
  4. Growth hormone receptor, molecular model
  5. TEEN Butterfly Flurry
  6. British Birds and Eggs II
  7. The Birds
  8. Golden-crowned Kinglet
  9. Conrad Gessner's nature collection
  10. Rhino skull Everard Home
  11. Flatiron Building II, New York City
  12. Araticum ape, annona montana, artwork
  13. Chest Anatomy, 19th Century Illustration
  14. Viral transfer of bacterial DNA, artwork
  15. Sooty Tern
  16. Summer Tree
  17. Finding the Body of One of their Companions, Scalped and Horribly Mangled
  18. Brain blood vessels
  19. The Watermill by the Ford
  20. Teen Collection - Heart Attack
  21. Teen Collection - Sealed With Love in Pink
  22. Buckminsterfullerene molecule
  23. 15th century surgical equipment, artwork
  24. Romeo
  25. Swallows
  26. Violet Butterflies II
  27. Hydraulics Explained
  28. Teen Collection - Princess
  29. German printing press inventors
  30. Violin, 17th century artwork
  31. Immigrants, NYC, 1877
  32. Solar cell
  33. 19th-century mining machine
  34. Antibiotic mechanism of action, artwork
  35. Neck and facial nerves
  36. Hunter of the Highlands, from 'Nature's Kingdom'
  37. Artist's impression of Tyrannosaurus rex
  38. Di(2-ethylhexyl) phthalate
  39. 1833 Jardine Papio sylvanus baboon
  40. Digestive system, artwork
  41. 1812 Egyptian Ibis
  42. Maniok Illustration From The Little Book Of Wonders Of The Tropics
  43. Human immune response, artwork
  44. Teen Collection - Love Flower Tattoo
  45. Guinea Fowl, from The Farnley Book of Birds, c.1816
  46. Acrobatic Parcel Delivery
  47. Cephalopd eye, artwork
  48. Bone death, artwork