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  1. Photomicroscopic close up of a snowflake crystal
  2. Ocean Jasper
  3. Normal shoulder, X-ray
  4. Bouncing ball
  5. Civil War, Texas Rangers, 1861
  6. Blood cells in blood vessel, artwork
  7. Signature of John Hancock
  8. The bones of the pelvis
  9. Martin Luther King, Jr. (1929-1968)
  10. Alberta, Reserve, c1890
  11. 'Rheumatoid arthritis of the hands, X-ray
  12. Meandering Mississippi - USGS Earth as Art
  13. Scrooge Objects to Christmas. Illustration for the novella A Christmas Carol
  14. Abraham Lincoln, 1809
  15. Microscopic view of bacteria
  16. Capitol From the Botanical Gardens
  17. Florence Nightingale (1820-1910) illustration from World Noted Women
  18. Molecule Cinnamon
  19. Chinese acupuncture model
  20. Normal hip, X-ray
  21. Distance of Sun, Moon and Planets
  22. Bears
  23. The sun sets behind a row of spinning windmills or wind turbines
  24. Pair of human hands on black background.
  25. Illustration By Arthur Rackham From Grimm's Fairy Tale, The Cunning Little Tailor
  26. Spilled Paint - USGS Earth as Art
  27. Pennsylvania, Gettysburg, Battle of Gettysburg, tree and battlefield monument, dawn
  28. Base of human skull, inferior view, with labels
  29. Apache Men, c1906
  30. Denver, Colorado, 1859
  31. Faridun's Sons Marry the Three Daughters of Sero. Shahnameh. The Book of Kings
  32. General Ulysses S. Grant leading Union troops into battle
  33. The Teacher
  34. Poe
  35. Molecule Licorice
  36. Neptune
  37. Lena Delta - USGS Earth as Art
  38. Vintage American History painting of Alexander Hamilton
  39. Mathematical Elements IV
  40. Australia, Northern Territory, Arnhem Land, Mt Borradaile, rock paintings
  41. The vertebral column
  42. A Pawnee Brave
  43. Arteries of the brain, 3D CT scan
  44. College Graduation Ceremony
  45. Roman Roads
  46. Wilson Dam, Flood Gates
  47. Bright Periodic Table - White, Classic Text
  48. Solar System II