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  1. TEEN Butterfly Flurry
  2. I Am Too Old for This
  3. Water clock, design from 1646
  4. Interior of human blood vessel showing a thrombus
  5. British Birds and Eggs II
  6. Flatiron Building II, New York City
  7. Golden-crowned Kinglet
  8. Rhino skull Everard Home
  9. Conrad Gessner's nature collection
  10. The Birds
  11. Araticum ape, annona montana, artwork
  12. Viral transfer of bacterial DNA, artwork
  13. Sooty Tern
  14. Teen Collection - Sealed With Love in Pink
  15. Summer Tree
  16. Chest Anatomy, 19th Century Illustration
  17. Finding the Body of One of their Companions, Scalped and Horribly Mangled
  18. Buckminsterfullerene molecule
  19. Swallows
  20. Brain blood vessels
  21. The Watermill by the Ford
  22. Teen Collection - Heart Attack
  23. Teen Collection - Princess
  24. Romeo
  25. Violet Butterflies II
  26. Hydraulics Explained
  27. 15th century surgical equipment, artwork
  28. Neck and facial nerves
  29. German printing press inventors
  30. Antibiotic mechanism of action, artwork
  31. 19th-century mining machine
  32. Solar cell
  33. Violin, 17th century artwork
  34. Immigrants, NYC, 1877
  35. Hunter of the Highlands, from 'Nature's Kingdom'
  36. Di(2-ethylhexyl) phthalate
  37. Artist's impression of Tyrannosaurus rex
  38. Digestive system, artwork
  39. Human immune response, artwork
  40. 1833 Jardine Papio sylvanus baboon
  41. Maniok Illustration From The Little Book Of Wonders Of The Tropics
  42. 1812 Egyptian Ibis
  43. Teen Collection - Love Flower Tattoo
  44. Bone death, artwork
  45. Guinea Fowl, from The Farnley Book of Birds, c.1816
  46. Save the products of the land - Eat more fish, 1917
  47. Alveoli
  48. Acrobatic Parcel Delivery