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  1. Virus particles entering cells, artwork
  2. Embryo development 24-36 hours after fertilization
  3. Surveyors Wanted to Explore Mars and its Moons
  4. Amethyst crystals
  5. Vintage Parchment Windmill 1906 Patent Poster
  6. Rocket launch
  7. Medical illustration detailing thoracic outlet syndrome
  8. Northern celestial map
  9. Salmonella bacteria, SEM
  10. American Frohse Anatomical Wallcharts, Plate II
  11. Close-up of an electronic circuit board
  12. Apollo Missions - Green Print: Retro Travel Poster
  13. Microscopic view of coronavirus
  14. Human anatomy showing deep muscles in the neck and upper back
  15. Architectural drawings
  16. The docking of SpaceX Dragon to the International Space Station above Earth
  17. Body musculature
  18. Bicycle diagram, 19th century
  19. Scanning electron micrograph of HIV particles infecting a human H9 T cell
  20. Electronic simulator, 1954
  21. Stem cells, artwork
  22. Skeleton Leans on Wall
  23. Castor oil stem, light micrograph
  24. Chinese acupuncture model
  25. Gas bubbles in oil
  26. Early electric lamps
  27. Lunar map of 1854
  28. Ear trumpets
  29. Electromagnetic spectrum
  30. Osteoclasts eroding bone in osteoporosis
  31. Earth
  32. Medical illustration of human leg muscles, four side views
  33. Superior view of human brain with colored lobes and labels
  34. Growth rings of a scots pine tree
  35. Gem Stones I
  36. Indigo Agate C
  37. Bolivia, Potosi, Amethyst in a Bolivian museum
  38. Galileo thermometer
  39. Normal shoulder, X-ray
  40. Alan Turing, British mathematician
  41. Oregon, Owyhee River Valley. Close-up of Morrisonite Jasper
  42. Muscles of the neck
  43. Cross section of planet Earth showing the inner core
  44. Leaded
  45. Stacked Agate I
  46. Bacterial Growth On Culture Media
  47. Heart attack, artwork
  48. Lung blood vessels