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  1. Electrocardiogram of human heartbeat, close-up
  2. Solar system map from 1853
  3. Virginia - USGS State Mosaic
  4. Formation of the Earth, artwork
  5. Abdominal organs in situ. abdominal cavity, digestive system
  6. Normal knee, X-ray
  7. Embryo development
  8. Buttercup stem, light micrograph
  9. Microprocessor chips
  10. Woman interacting with multiple touch screens
  11. Artificial heart, 19th century
  12. Sex-linked inheritance of white eyes in Drosophila flies
  13. Nicolaus Copernicus, Polish astronomer
  14. Total lunar eclipse of 1877
  15. Molecule THC
  16. Molecule Cinnamon
  17. Dandy Bones
  18. Breast anatomy, artwork
  19. 3<4
  20. Barn owl
  21. 3d electron orbitals
  22. Microscope
  23. Right radius and ulna bones in supination - anterior view. skeletal system
  24. Dental X-ray
  25. Wisconsin - USGS State Mosaic
  26. Torso bones
  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. Muybridge Motion Study, 1870s
  30. Quartz crystals
  31. Mushroom Chart I light
  32. Cell
  33. Medical and laboratory shots
  34. Vintage Parchment Hydraulic Drilling Rig Patent Poster
  35. Surgical equipment
  36. Oregon, Owyhee River Valley. Close-up of Morrisonite Jasper
  37. F/col STM image of DNA (isometric projection)
  38. The nerve supply of the upper body
  39. Rib cage and heart, 3D CT scan
  40. Pneumonia Strikes like a Man Eating Shark - WPA Poster
  41. Graduated Cylinders And Flasks
  42. Cosmic Periodic Table
  43. A selection of galaxies shown to the same scale
  44. Portrait of Carl Friedrich Gauss, 1840
  45. Coronary Artery Bypass
  46. Brain anatomy, 16th century diagram
  47. Stages in human evolution
  48. Cardiac muscle, TEM