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  1. Pi to 2198 decimal place
  2. Bullfrog
  3. Vintage Civil War print of President Abraham Lincoln and his cabinet
  4. Balance
  5. Edwin Hubble's Galaxy Classification System
  6. Women's Rights Parade, 1913
  7. Relaxing feet.
  8. Civil War print depicting the Union Army's capture of Fort Fisher
  9. Muhammad Ali on the shore of the Congo River, Kinshasa, Zaire
  10. Young boy in school writing on chalkboard
  11. Vintage Civil War print of the Battle of Fredericksburg
  12. Washing Gold, Calaveras, California, 1853
  13. College Graduation Ceremony
  14. Sir John Hawkins (1532-95)
  15. Listen to your Teacher
  16. Human anatomy showing deep muscles in the neck and upper back
  17. Blood clot, SEM
  18. Distance of Sun, Moon and Planets
  19. Ocean Jasper
  20. Bouncing ball
  21. Normal shoulder, X-ray
  22. Artist's Rendering Of A Solar System
  23. Alberta, Reserve, c1890
  24. Microscopic view of bacteria
  25. Signature of John Hancock
  26. Capitol From the Botanical Gardens
  27. Denver, Colorado, 1859
  28. The sun sets behind a row of spinning windmills or wind turbines
  29. Solar System II
  30. Pair of human hands on black background.
  31. Mathematical Elements IV
  32. Pastel Periodic Table - Classic Text
  33. Bright Periodic Table - White, Classic Text
  34. Normal shoulder, X-ray
  35. Portrait Of Rosa Parks, Civil Rights Leader
  36. Teacher's desk in classroom
  37. RMS Titanic being moved out of drydock, March 6, 1912
  38. Replica Of Eli Whitney's Cotton Gin
  39. Diphtheria treatment, artwork
  40. Newsboy Ned Parfett announcing the sinking of the 'Titanic' on April 16, 1912
  41. Hampton Institute, 1899
  42. Joan of Arc Re-Captures City of Beaugency From the British
  43. Close-Up Of Fortification Laguna Agate
  44. Christmas Jasper
  45. Sioux Dance, 1890
  46. Vintage Civil War print of President Abraham Lincoln and his cabinet
  47. Kentucky - USGS State Mosaic
  48. Native Americans Bringing Furs To Dutch Traders