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  1. Cardiac muscle, SEM
  2. Star trails and bioluminescence, Gippsland Lakes, Australia
  3. Mining drill core sample with gold content
  4. Shooting An Oil Well
  5. Nerve cell, artwork
  6. Idaho - USGS State Mosaic
  7. Running On The Wind
  8. Global Circulation Patterns Diagram
  9. Heart anatomy, 18th century
  10. Nikola Tesla
  11. Oil drilling rigs out in the ocean with a view of the coastline, Invergordon, Scotland
  12. Oregon. Close-up of Owyhee Picture Jasper stone
  13. Oregon, Owyhee. Close-up of picture jasper stone
  14. Himalayas - USGS Earth as Art
  15. Stem cell, conceptual artwork
  16. Cyanobacteria, SEM
  17. Diphtheria treatment, artwork
  18. Christmas Jasper
  19. Scanning electron micrograph of an apoptotic HeLa cell
  20. Subatomic particles abstract
  21. Vermont - USGS State Mosaic
  22. Forensic evidence
  23. Oklahoma - USGS State Mosaic
  24. Donati's Comet of 1858, artwork
  25. Blood types, conceptual image
  26. Geography of the Heavens VI
  27. Computer memory chips
  28. Turquoise gemstone
  29. Astronomical Chart I
  30. Volcanoes - USGS Earth as Art
  31. Pollen grains, SEM
  32. Mars
  33. Cretaceous dinosaurs
  34. Geranium (Pelargonium sp.) leaves
  35. Minnesota - USGS State Mosaic
  36. The analysis of sound frequencies by the basilar membrane
  37. Instruments for removing bladder stones
  38. Cross section of human blood vessel showing atherosclerosis
  39. Ice Stars - USGS Earth as Art
  40. Cold War medical training, 1958
  41. Eye anatomy, artwork
  42. Anterior view and sagittal view of female urinary bladder
  43. Jurassic landscape, artwork
  44. Confidence of Alexander the Great into his physician Philippos, 1870
  45. Artwork of Caudipteryx sp., a bird-like dinosaur
  46. Standard electrical circuit symbols
  47. Shame may be Fatal - WPA Poster
  48. Time-lapse image of a solar eclipse