Categories - Science

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  1. Archaeologists Unearth Ancient Scrolls
  2. Archimedes
  3. Ardrey’s The Territorial Imperative Argues That Humans Are Naturally Territorial
  4. Aristotle
  5. Armstrong Perfects FM Radio
  6. Arnold and Gottlieb Publish The Wise Use Agenda
  7. The Arroyo Seco Freeway Opens in Los Angeles
  8. Arthur Holly Compton
  9. Artificial Fluoridation of Municipal Water Supplies to Prevent Dental Decay Is Introduced
  10. The Artificial Sweetener Cyclamate Is Introduced
  11. Asa Gray
  12. Asclepiades of Bithynia
  13. Aserinsky Discovers Rapid Eye Movement (REM) in Sleep and Dreams
  14. Aston Builds the First Mass Spectrograph and Discovers Isotopes
  15. Astronauts Renovate Hubble Telescope
  16. Astronauts Repair the Hubble Space Telescope
  17. Astronomers Detect Black Hole
  18. Astronomers Detect Planets Orbiting Another Star
  19. Astronomers Discover an Unusual Ring System of Planet Neptune
  20. Astronomers Discover Solar System with Three Planets
  21. Astronomers Discover the Rings of the Planet Uranus
  22. Astronomers See Light from Object 12.2 Billion Light-Years Away
  23. Astronomy
  24. Atlas-Centaur Rocket Is Developed
  25. Atomic Bombing of Japan
  26. Atomic Bombs Destroy Hiroshima and Nagasaki
  27. Atomic Energy Act
  28. The Atomic Energy Commission Is Established
  29. August Krogh
  30. August Weismann
  31. Auguste Comte Advances Theory of Positivism
  32. Automakers Introduce the Catalytic Converter
  33. Avery, Macleod, and McCarty Determine That DNA Carries Hereditary Information
  34. Avicenna
  35. Baade Corrects an Error in the Cepheid Luminosity Scale
  36. Bacon Designs First Fuel Cell
  37. Baekeland Invents Bakelite
  38. Banach Sets Stage for Abstract Spaces
  39. Bardeen, Cooper, and Schrieffer Explain Superconductivity
  40. Barghoorn and Coworkers Find Amino Acids in 3-Billion-Year-Old Rocks
  41. Barghoorn and Tyler Discover 2-Billion-Year-Old Microfossils
  42. Barkla Discovers the Characteristic X Rays of the Elements
  43. Barnard Performs the First Human Heart Transplant
  44. Baron Florey
  45. Bateson and Punnett Observe Gene Linkage
  46. Baulieu Develops RU-486, a Pill That Induces Abortion
  47. Bayliss and Starling Discover Secretin and Establish the Role of Hormones
  48. The Becquerel Family
  49. Becquerel Wins the Nobel Prize for the Discovery of Natural Radioactivity
  50. Bednorz and Müller Discover a High-Temperature Superconductor
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