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  1. Entropy
  2. Habitable Zone
  3. Rosie The Riveter vintage war poster from World War II
  4. George Washington, by Rembrandt Peale, c. 1850
  5. Strings
  6. Electromagnetic Radiation
  7. Albert Einstein
  8. Oregon, Owyhee River Valley. Close-up of Morrisonite Jasper
  9. Vintage Civil War print of the Battle of Franklin
  10. Vintage Civil War print of the Battle of Cold Harbor
  11. Tiny Engineers Fixing a Broken Chip on a Motherboard
  12. Saturn
  13. Cave of Lascaux. (c.17000-15000 BC) Montignac, France
  14. Pipette Dripping Liquid Into Test Tubes
  15. Carl Sagan
  16. Arthritis of the neck, X-ray
  17. John Brown on 30 August 1856 intercepting a body of pro-slavery men
  18. Earth
  19. Stacked Agate II
  20. Mars
  21. Highlights from History: Ireland's 'Great Rebellion'
  22. Tesla
  23. Ocean Jasper
  24. 'Rheumatoid arthritis of the hands, X-ray
  25. Lena Delta - USGS Earth as Art
  26. Dental X-ray
  27. Portrait Of Rosa Parks, Civil Rights Leader
  28. Nikola Tesla With An Early Tesla Coil
  29. Poppy Jasper
  30. Conceptual image of neuron
  31. Magic Money
  32. The Tea Party II
  33. Conceptual image of DNA
  34. Richat Structure - USGS Earth as Art
  35. The bones of the neck
  36. Elastic artery cross-section, SEM
  37. Laboratory Equipments
  38. Moses and the Burning Bush
  39. Scanning electron micrograph of HIV particles infecting a human T cell
  40. California, Palm Springs. Windmill Farm along North Indian Canyon Drive
  41. Annunciation to the Shepherds. Book of Hours of Leonor de la Vega. 1465-70
  42. Alice And The Caterpillar
  43. The Swedish Warship Vasa
  44. Antietam, Maryland, 1862
  45. The Battle of Cannae in 216 BC
  46. Pinned broken leg, X-ray
  47. Cingulate gyrus in the brain, artwork
  48. Marie Curie