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  1. Barbara McClintock, in her laboratory at Cold Spring Harbor, New York, in 1947
  2. The Memorial To The Murdered Jews Of Europe, Berlin, Germany
  3. Washington's Entry Into New York On The Evacuation Of The City By The British In 1783
  4. Camera man Don Clark and Director James Tinling film a scene for 'Change of Heart'
  5. Taking Off..., illustration from 'Wings Across the World', 1978
  6. Former Beatle George Harrison (left) and Indian musician Ravi Shankar
  7. Donati's Comet of 1858, artwork
  8. Ferry boat altered to gunboat during the American Civil War
  9. Diphtheria treatment, artwork
  10. Fortifications in front of Atlanta, Georgia, during the American Civil War
  11. View Of Danzig, Poland From River, 1939
  12. The Inauguration Of First President Of The United States In 1789, New York
  13. Soldiers at camp during the American Civil War
  14. House Chambers In The U. S. Capitol
  15. Barack Obama (1961- )
  16. Barack Obama (1961- )
  17. Instruments for removing bladder stones
  18. Cold War medical training, 1958
  19. Knocking-off time at the Harland
  20. General Philip Kearny's fatal charge at the Battle of Chantilly
  21. Fun Facts about the U.S. Presidents
  22. Aden From The Air
  23. Niels Bohr, James Franck, Albert Einstein, and Isidor Rabi
  24. 19th Century internal combustion engine
  25. Chamber Cranes In Pedro Miguel Locks
  26. Neptune fountain at Navona square, Rome
  27. Camel riders at Giza Pyramids, Giza, Cairo, Egypt, Africa
  28. Elijah Muhammad (1897-1975)
  29. Japanese Samurai Blade
  30. Plans For The Maryland State House
  31. German WWII ramjet bomber blueprint
  32. Early American steam locomotive
  33. A Prehistoric Mammoth Hunt
  34. World Trade Center Ground Zero site under reconstruction Sept 8, 2011
  35. The Krak des Chevaliers, Crusader castle, Syria, Middle East
  36. Newgrange, County Meath, Leinster, Republic of Ireland, Europe
  37. Woman standing at long row of bobbins, at a textile factory, Millville, NJ, 1936
  38. Silversmith at work, c.1914
  39. Department Of Justice Building In Washington D. C
  40. Check Up
  41. Pascal's calculator, 17th Century artwork
  42. Edison talking into his phonograph
  43. Ensisheim meteor fall, 1492
  44. Eiffel Tower During Construction
  45. Lovecraft
  46. The Earth's seasons
  47. Painting of a wallaby at the Aboriginal rock art site at Ubirr Rock, Australia
  48. War-dance of Bantu tribesmen