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  1. Human bones
  2. Hand doing math homework
  3. Teacher's desk in classroom
  4. Geometry tools
  5. Geometry tools
  6. x-ray of head
  7. Dental X-ray
  8. Definition of anthropology
  9. Cross section image of human head
  10. Constitution of the united states of america
  11. Pi to 2198 decimal places
  12. Pi to 2198 decimal place
  13. Pythagoras Maths Equation
  14. Pythagoras Maths Equation
  15. Chiropractic skeleton
  16. Chalkboard with greetings written in English, French and German
  17. Cardiovascular scan
  18. Caduceus and graph
  19. Blood clot, SEM
  20. Arthritis of the neck, X-ray
  21. Arthritis of the neck, X-ray
  22. Arthritis of the knee, X-ray
  23. Arthritis of the knee, X-ray
  24. Arthritis of the hip, X-ray
  25. Arteries of the brain, 3D CT scan
  26. Abacus.
  27. Book
  28. Abstract image of stock market line chart with text
  29. School supplies
  30. Row of pencils on table
  31. Pencils
  32. Library bookshelves
  33. Girl looking over stack of books
  34. Dice on math game
  35. A diagram of the Milky Way, depicting its various named parts
  36. Orbits of Earth Crossing Asteroids
  37. Edwin Hubble's Galaxy Classification System
  38. Illustration showing the various parts that make up the sun
  39. Black Hole Singularity Diagram
  40. A diagram showing the phases of the Earths moon
  41. A simplified Herzprung Russell Diagram showing how stars are classified
  42. The Milky Way and the other members of our Local Group of galaxies
  43. College Graduation Ceremony
  44. Global map of Saturns moon Dione