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  1. Solar System - Old
  2. Weak Force
  3. Development of the English alphabet
  4. Apache On Horseback, c1903
  5. Abraham Lincoln, by George Peter Alexander Healy, 1860
  6. George Washington, by Gilbert Stuart, c. 1803-05
  7. Normal neck, X-ray
  8. Andrew Jackson, by Thomas Sully, 1845
  9. The Hare Afraid by His Ears, La Fontaine's Fables
  10. The Reading Room on board the Titanic, 1912
  11. The Tea Party
  12. Multi-Life
  13. Benjamin Franklin, 1782
  14. Timeline of Animals
  15. Spanish Conquistadors
  16. Obama: Change
  17. Vintage World War II poster featuring a male lion
  18. Diesel Motor
  19. Jet Engine
  20. We Need You
  21. Flowering Plum Orchard (After Hiroshige), 1887
  22. Calculator
  23. Herb Chart
  24. 'The Tyger', Plate 36 From 'Songs Of Innocence And Of Experience'
  25. The Presidents Educational Poster, 2013
  26. American Jazz Saxophone Player John Coltrane, 1957
  27. John Adams, by Gilbert Stuart, c. 1800-15
  28. Bolivia, Potosi, Amethyst in a Bolivian museum
  29. Lincoln's Gettysburg Address
  30. The bones of the trunk
  31. Gas Station, Wild West Painting Series
  32. Genius Handlettering
  33. Normal spine, X-ray
  34. Portrait of Chief Red Cloud in headdress
  35. Paul Revere By John Singleton Copley
  36. Let Freedom Ring I
  37. Brain, artwork
  38. Solar System - Minimal
  39. Obama: Believe
  40. Portrait Of Harriet Tubman, 1870
  41. Let Freedom Ring II
  42. John Coltrane Playing The Soprano Saxophone, 1960's
  43. In A Stampede
  44. Old Brass', a native North American, 19th century
  45. Ra
  46. The Hare and the Tortoise, illustration from Aesop's Fables
  47. Portrait Of John Brown
  48. Light Bulb