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  1. A black and white image of two light bulbs, one containing running water.
  2. Telecommunication Towers near Bulls Head, Dingle Peninsula, County Kerry, Ireland
  3. Fiber optic cable
  4. Blood centrifuge
  5. Genome sequencing machine
  6. Man and Machine
  7. Light bulb
  8. Light bulb, historical artwork
  9. Palmtop
  10. Parkes radio telescope at night, Parkes, NSW, Australia.
  11. An early telephone
  12. Garnerin's parachute design, 1797
  13. Vieques, Puerto Rico, A laptop is sitting in the middle of an unmade hotel bed
  14. Telecommunication Towers near Bulls Head, Dingle Peninsula, County Kerry, Ireland
  15. Hornblower's engine
  16. Cut-away artwork of a windmill for grinding corn
  17. Computer graphic line graph, full frame
  18. Refractor telescope, 1928
  19. Chit Chat
  20. Chain and lock on laptop computer
  21. Hydraulics Explained
  22. 19th-century mining machine
  23. Solar cell
  24. Oscilloscope trace
  25. German printing press inventors
  26. Actress Norma Shearer inspects a sound proof camera
  27. United States, Satellite Dish
  28. Boring a hole
  29. Solar park, Ciudad Real, Spain
  30. United States, California, Owens Valley Radio Observatory (OVRO), Radio Telescope
  31. Engraving of the Bullock Rotary Press of 1865
  32. Grain Mills
  33. Worker examining empty airplane
  34. Recording thumbprint
  35. Television studio engineer gets several views of the image
  36. Diamond-tipped drill, 19th century
  37. Eighteenth Century Illustration Of A New Machine To Go Without Horses
  38. Lamps connected in series
  39. Early escalator, 1894
  40. Lamps connected in parallel
  41. Various diodes