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  1. E. coli bacteria, SEM
  2. Museum of Science and Industry Vehicles - Chicago, IL: Retro Travel Poster
  3. 16th century world map
  4. Tyrannosaurus rex dinosaur skull
  5. Conceptual image of mitosis
  6. Muscles of the abdominal wall - anterior view
  7. Lung tissue, TEM
  8. Jurassic life, artwork
  9. Stacked Agate II
  10. Body musculature
  11. Jurassic dinosaurs
  12. Leonid meteor shower of 1833, artwork
  13. Sunflower - Botanical Illustration
  14. Pipette Dripping Liquid Into Test Tubes
  15. Grey Agate B
  16. Caduceus, artwork
  17. 1951 space shuttle design
  18. Femur - anterior view. skeletal system
  19. Sir Isaac Newton
  20. Wire Your Home Window Display
  21. The Saturday Evening Post, Do As Your Doctor Tells You
  22. ECGs of a normal heart rate, artwork
  23. Cardiac muscle, TEM
  24. Southern celestial map
  25. Brain, artwork
  26. Apothecary
  27. Semiconservative DNA Replication
  28. Computer hard disk assembly
  29. Heart anatomy, 19th Century illustration
  30. Artwork showing Chicxulub impact crater, Yucatan
  31. Green Blue Optic fiber
  32. Bracken rhizome, light micrograph
  33. Armillary sphere
  34. Van Gogh from Space - USGS Earth as Art
  35. Lung cells, fluorescent micrograph
  36. Stethoscope
  37. Wave energy
  38. Antique pharmacy bottles
  39. Plant cell
  40. 1858 Prehistoric marine reptiles
  41. Wilson Dam, Flood Gates
  42. Depiction of different phases of the Moon by Galileo Galilei
  43. Bees
  44. Splashing wave, split view
  45. Female hormone
  46. Virus particles entering cells, artwork
  47. Normal hip, X-ray
  48. Embryo development 24-36 hours after fertilization