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  1. Salt dissolution, artwork
  2. Lung bronchioles
  3. Love Birds
  4. Carboniferous landscape
  5. Bare-knuckle Boxers
  6. Lungs
  7. Clouds forming the shape of Earth's continents
  8. Viral throat infection, artwork
  9. Carrigogunnell Castle, Near Limerick, County Limerick, Ireland
  10. Sierre to Zinal Mountain Race, The Finish 2012
  11. Platelet, artwork
  12. Killdeer
  13. 19th Century internal combustion engine
  14. Construction of the Pyramids
  15. Artwork of Mars Polar Lander descending onto Mars
  16. Durer's world map, 1515
  17. Composite image of the phases of the Moon
  18. Ichthyosaur and prey
  19. Rhodopsin protein molecule
  20. TEEN Flutter of Love
  21. Chinese armada, artwork
  22. Vintage Golden Gate
  23. Cabeza De Vaca Expedition
  24. 'How vain are all your triumphs past', 1814
  25. sports car with high speed
  26. Sound Wave 2
  27. Walleye on Map
  28. Armillary sphere, 18th Century artwork
  29. Magnetic field
  30. Instruments for removing bladder stones
  31. Snap!
  32. Detail of 16th century map of Liguria
  33. Leptin molecule
  34. Steamboats on the Mississippi
  35. Wooded Path II
  36. Neanderthals hunt a cave bear
  37. Triceratops
  38. Famous places and monuments of the world
  39. Environs Of Paris 1
  40. City Of Golden Dreams - Contemporary Cityscape Painting
  41. Early electric train
  42. Woolly mammoths
  43. Zebra and Butterflies
  44. Alveoli
  45. Construction of the DH.98 Mosquito fighter-bomber of World War II
  46. Protein tyrosine phosphatase molecule
  47. Early stromatolites, artwork
  48. Mountain, or sewellel, beaver