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  1. Pollen grains, SEM
  2. Cross section image of human head
  3. Colorized scanning electron micrograph of filamentous Ebola virus particles
  4. Standard lathe
  5. Twilight hues in the sky, Great Yarmouth, Norfolk, England
  6. Arterial supply and venous drainage of the organs.
  7. Alchemy
  8. High-pressure steam engine, 19th century
  9. Deinonychus
  10. Cartilage cells, TEM
  11. Rocky Mountains - USGS Earth as Art
  12. Pylons in a rural landscape at dusk
  13. Colored engraving of Newton's reflecting telescope
  14. Abstract line pattern.
  15. Electrocardiogram of human heartbeat, close-up
  16. Geography of the Heavens VI
  17. Right lung - medial view. respiratory system
  18. Medical treatment, conceptual image
  19. Venus Under False Color
  20. Nerve synapse, artwork
  21. Noctis Labyrinthus, Mars
  22. Edwin Hubble, US astronomer
  23. Soap bubbles
  24. Blood clot, SEM
  25. Triceratops
  26. Medical chart showing the signs and symptoms of sciatica
  27. Human Skull
  28. Walnut tree trunk
  29. Sets of fingerprints
  30. Oak sapling (Quercus robur)
  31. Leptin molecule
  32. Rosalind Franklin, British chemist
  33. Rubber and gutta-percha molecular models
  34. Heron/Hero of Alexandria, mathematician
  35. Electronics Illustrated, March
  36. Laboratory flask and circuit board
  37. Early electric train
  38. NASA, Houston, Texas
  39. Anterior neck and facial muscles of the human head (with labels)
  40. Meandering Mississippi - USGS Earth as Art
  41. Anterior view of human skull, with labels
  42. Woolly mammoths
  43. Oregon, Owyhee River Valley. Close-up of Morrisonite Jasper
  44. Faraday's electrolysis experiment, 1833
  45. Laboratory glassware
  46. Computer artwork of a beryllium atom
  47. Female muscles, artwork
  48. The docking of SpaceX Dragon to the International Space Station above Earth