1. wages, 1, 2
2. Wallace, Alfred Russel, 1, 2 n. 2
3. war, 1, 2
4. water, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 n. 9; 15 n. 5, 16 n. 16, 17 n. 7;
   1. boiling, 1, 2;
   2. condensation, 1;
   3. erosion, 1;
   4. molecular structure, 1;
   5. power, 1, 2, 3;
   6. swirl direction, 1;
   7. ultrapure, 1 n. 7;
   8. vapour, 1, 2, 3, 4, 5 n. 4;
   9. see also evaporation, ice: fresh-water, ice, sea ice, steam, wetness
5. water wheel, 1
6. Watson, James, 1, 2 n. 6
7. Watson, Thomas J., 1
8. wavelength, 1, 2, 3 n. 14
9. waves, 1;
10. gravitational, 1;
    1. interference, 1, 2 n. 8;
    2. superposition, 1, 2, 3, 4 n. 8;
    3. see also light: as waves, quantum waves, radio waves, sound waves
11. weapons, 1, 2, 3
12. Weather Girls, 1
13. weather forecasting, 1
14. weather systems, 1;
    1. anticyclones, 1;
    2. cyclones, 1
15. weathering, 1
16. Wegener, Alfred, 1, 2, 3
17. Weyl, Herman, 1
18. Weinberg, Steven, 1, 2
19. wetness, 1
20. whales, 1;
    1. killer whales, 1;
    2. short-finned
    3. pilot whales, 1
21. wheat, 1
22. Wheeler, John, 1, 2, 3, 4, 5, 6 n. 3
23. white dwarfs, 1
24. Wigner, Eugene, 1
25. Wilde, Oscar, 1, 2, 3
26. Wilkinson Microwave Anisotropy Probe, 1 n. 18
27. William the Conqueror, 1
28. Williams, Tennessee, 1
29. Wilson, Edward O., 1, 2
30. wind: erosion, 1;
    1. high-altitude, 1;
    2. power, 1, 2;
    3. see also jet stream, stellar winds, trade winds
31. windmills, 1
32. Winnipeg, Canada, 1
33. wire coil, conducting, 1, 2, 3, 4 n. 15
34. Woese, Carl, 1 n. 5
35. wolf, 1
36. Wolpert, Lewis, 1 n. 7
37. womb, see uterus
38. work, 1, 2 n. 1, 3 n. 7
39. World War I, 1
40. World War II, 1
41. World Wide Web, 1, 2
42. worms, intestinal, 1
43. Wright, Stephen, 1
44. writing, 1, 2
45. WTO (World Trade Organisation), 1