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  1. Sickle cell anaemia
  2. 19th Century internal combustion engine
  3. Colorado - USGS State Mosaic
  4. Rocket launch
  5. Vintage Parchment Otoscope Patent Print
  6. Johannes Kepler and Tycho Brahe
  7. 4d electron orbitals
  8. Skeleton and Shovel
  9. Cardiac muscle, TEM
  10. Saturn V rocket engine, US Space and Rocket Center, Huntsville, Alabama
  11. Microscopic view of rotavirus
  12. Study of the Human Figure, Anterior View
  13. Patent--Aerial Machine
  14. How Seeds Travel
  15. Colored engraving of Newton's reflecting telescope
  16. Gas bubbles in oil
  17. Balance
  18. Male skeleton, artwork
  19. Mouthwash swirling around teeth
  20. DNA molecule
  21. Standard lathe
  22. Leukemia blood cells, light micrograph
  23. Utah - USGS State Mosaic
  24. Oregon. Close-up of Graveyard Point Plume Agate stone
  25. Veins and nerves of the neck. cardiovascular system, nervous system
  26. Caduceus and graph
  27. Living Relatives of Dinoaurs
  28. Ammonite
  29. Rice Terraces, Longsheng Ping'an, Guangxi
  30. Light echoes from exploding star
  31. The Summer Road
  32. Wave energy
  33. Male Hercules Beetle
  34. Early petrol locomotives
  35. Organ of Corti, inner ear, SEM
  36. Malachite
  37. Healthy brain, MRI scans
  38. Louis Pasteur, French microbiologist
  39. Anterior view of human pelvis, with labels
  40. Decoherence in quantum computing
  41. Quartz crystals
  42. Earth Agate A
  43. Child's foot, X-ray
  44. Comparison of bones of forearm and lower leg - anterior view. skeletal system
  45. Assembly Required to Build Our Future on Mars and its Moons
  46. Illustration of a whiplash injury to the neck
  47. Osteoclasts in bone lacunae, SEM
  48. Table of mathematical functions