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  1. ATP Synthase Enzyme Complex, Illustration
  2. Electrocardiogram of human heartbeat, close-up
  3. Fountain Pen
  4. Virginia - USGS State Mosaic
  5. Formation of the Earth, artwork
  6. Normal knee, X-ray
  7. Buttercup stem, light micrograph
  8. Microprocessor chips
  9. Woman interacting with multiple touch screens
  10. Artificial heart, 19th century
  11. Sex-linked inheritance of white eyes in Drosophila flies
  12. Abdominal organs in situ. abdominal cavity, digestive system
  13. Nicolaus Copernicus, Polish astronomer
  14. Total lunar eclipse of 1877
  15. Molecule THC
  16. Molecule Cinnamon
  17. 3<4
  18. Dandy Bones
  19. 3d electron orbitals
  20. Breast anatomy, artwork
  21. Dental X-ray
  22. Microscope
  23. Right radius and ulna bones in supination - anterior view. skeletal system
  24. Wisconsin - USGS State Mosaic
  25. Torso bones
  26. Embryo development
  27. Blue liquid being dropped into a beaker of clear water
  28. An Allosaurus Stalking A Herd Of Camarasaurus Dinosaurs Grazing At The Water's Edge
  29. Cell
  30. Muybridge Motion Study, 1870s
  31. Medical and laboratory shots
  32. Quartz crystals
  33. Mushroom Chart I light
  34. Barn owl
  35. Oregon, Owyhee River Valley. Close-up of Morrisonite Jasper
  36. Surgical equipment
  37. Vintage Parchment Hydraulic Drilling Rig Patent Poster
  38. Pneumonia Strikes like a Man Eating Shark - WPA Poster
  39. Rib cage and heart, 3D CT scan
  40. F/col STM image of DNA (isometric projection)
  41. The nerve supply of the upper body
  42. Graduated Cylinders And Flasks
  43. A selection of galaxies shown to the same scale
  44. Cosmic Periodic Table
  45. Artwork showing the pupil of eye in varying light
  46. Brain anatomy, 16th century diagram
  47. Coronary Artery Bypass
  48. Stages in human evolution