1. absolute zero, 1, 2 n. 7
  2. AC (alternating current), 1, 2, 3 n. 19
  3. acceleration, 1, 2, 3, 4 n. 2, 5 n. 6 infra;
    1. see also gravity
  4. acetycholine, 1
  5. acidity, 1
  6. acids, 1, 2;
    1. fatty acids, see lipids;
    2. see also amino acids
  7. Acorn Computers, 1
  8. Ada computer language, 1 n. 3
  9. Adams, Douglas, 1, 2
  10. Adder’s-tongue fern, see Ophioglossum vulgatum
  11. adenine, 1
  12. aeroplanes, 1, 2, 3 n. 9;
    1. Boeing 747, 1
  13. Afar, Ethiopia, 1
  14. Africa, 1, 2, 3, 4, 5, 6, 7, 8;
    1. see also South Africa
  15. Agassiz, Louis, 1
  16. agriculture, see farming
  17. air, 1, 2, 3, 4;
    1. convection, 1, 2, 3 n. 8, 4 nn. 10, 12; 5 n. 16;
    2. pressure, 1;
    3. pressure equalisation, 1;
    4. resistance, 1;
    5. in a thunderstorm, 1, 2 nn. 7, 9;
    6. see also Earth: atmosphere, Hadley circulation cells, vortices, weather systems, wind
  18. alchemy, 1
  19. alcohol, 1
  20. algae, 1 n. 6;
    1. blue-green, 1, 2
  21. alleles, 1
  22. Allen, Tim, 1
  23. Allen, Woody, 1
  24. alpacas, 1
  25. Alpha Centauri, 1, 2
  26. alpha particles, 1, 2
  27. altruism, 1
  28. alveoli, 1
  29. Amazon.com, 1
  30. Americans, Native, 1;
    1. see also Aztecs, Incas
  31. Americas, 1;
    1. see also North America, South America
  32. amino acids, 1, 2, 3
  33. amygdala, see limbic system
  34. ancestry, 1 n. 13
  35. Anderson, Philip, 1
  36. Andes, 1, 2
  37. Andromeda Galaxy, 1, 2
  38. angular momentum, 1;
    1. law of conservation of, 1, 2
  39. animals, 1;
    1. diseases, 1;
    2. domestication, 1, 2, 3, 4, 5;
    3. extinction, 1, 2;
    4. and food, 1;
    5. interbreeding, 1;
    6. mitochondria, 1;
    7. multicellular, 1, 2;
    8. as pets, 1;
    9. as prey, 1;
    10. reproduction, 1, 2;
    11. respiration, 1, 2, 3, 4;
    12. sight, 1;
    13. single-celled, 1;
    14. stamina, 1;
    15. variation, 1, 2, 3;
    16. see also bones, clothing, meat, natural selection, nervous system
  40. Antarctic ice sheet, 1
  41. Antarctica, 1, 2, 3
  42. antibiotics, 1, 2, 3;
    1. resistance to, 1
  43. anticyclones, see weather systems
  44. antimatter, 1
  45. antiparticles, 1, 2;
    1. electrical charge, 1;
    2. spin, 1
  46. anti-quarks, 1
  47. ants, 1
  48. apes, 1, 2, 3, 4, 5, 6, 7
  49. Apollo 1, 2
  50. apoptosis, 1
  51. archaea bacteria, 1, 2 nn. 5, 6
  52. Arctic Sea, 1
  53. argon, 1
  54. ARM, 1
  55. Armstrong, Neil, 1
  56. arsenic, 1
  57. art and artists, 1, 2
  58. artificial selection, 1
  59. asexual reproduction, 1, 2, 3
  60. Asia, 1, 2, 3, 4
  61. Aspect, Alain, 1
  62. asteroids, 1
  63. astronomy and astronomers, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13
  64. @Katharine_T1m, 2 n. 7
  65. @MrDFJBaileyEsq, 1 n. 17
  66. Atkins, Peter, 1, 2
  67. Atlantic Ocean, 1, 2, 3, 4, 5, 6;
    1. see also mid-Atlantic Ridge, transatlantic cables
  68. atomic clock, 1, 2
  69. atoms, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 n. 2, 15 n. 15, 16 n. 13, 17 n. 4, 18 n. 5, 19 n. 2, 20 n. 10, 21 n. 7, 22 n. 12, 23 n. 14;
    1. alignment, 1;
    2. doping, 1, 2;
    3. electrically charged, 1, 2, 3 n. 6;
    4. nucleus, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 n. 6, 14 n. 3, 15 n. 14, 16 n. 2, 17 n. 10, 18 nn. 6, 8; 19 n. 14;
    5. and quantum theory, 1, 2, 3, 4, 5, 6 n. 5;
    6. structure, 1, 2, 3 n. 3;
    7. see also electrons, leptons, molecules, muons, neutrons, neutrinos, photons, protons, quarks
  70. ATP (adenosine triphosphate), 1, 2, 3
  71. Augarten, Stan, 1
  72. austerity, 1
  73. Australia, 1, 2;
    1. fossils, 1
  74. australopithecines, 1, 2, 3
  75. Australopithecus afarensis, 1
  76. Australopithecus anamensis, 1
  77. axes, 1
  78. axons, see nerve cells
  79. Aztecs, 1