1. taus, 1;
   1. see also neutrinos
2. taxation, 1 n. 2
3. taxi drivers, 1, 2
4. Taylor, Joseph, 1
5. tectonic plates, 1;
   1. see also plate tectonics
6. teeth, 1, 2
7. Tegmark, Max, 1 n. 5
8. telecommunications, 1, 2
9. telescopes, 1, 2, 3, 4
10. television, 1, 2
11. temperature, 1, 2, 3, 4, 5, 6, 7, 8 n. 3, 9 nn. 7, 8, 10; 10 n. 13, 11 n. 7;
    1. see also absolute zero, body temperature, Celsius scale, Earth: temperature, Kelvin scale, Sun: temperature
12. Terry, John, 1
13. Tesla, Nikola, 1
14. testes, 1
15. testosterone, 1
16. thermodynamics, 1, 2;
    1. first law of, 1;
    2. second law of, 1, 2, 3, 4 n. 8, 5 n. 9
17. Thiomargarita namibiensis, 1
18. Thomas, Lewis, 1, 2, 3, 4, 5, 6, 7
19. Thomson, George, 1, 2 n. 8
20. Thomson, J. J., 1
21. thorium, 1
22. thunderstorm, 1, 2, 3, 4 n. 9
23. thymine, 1
24. Tigris river, 1
25. time, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17 n. 4, 18 n. 3;
    1. ‘arrow’, 1;
    2. dilation, 1, 2;
    3. see also space–time
26. tools, 1, 2, 3, 4, 5, 6
27. trade, 1, 2, 3, 4, 5;
    1. international, 1;
    2. and space, 1;
    3. and time, 1;
    4. see also exchange rate, marketplace, supply and demand
28. trade winds, 1
29. trading circle, 1
30. traits, 1, 2, 3
31. transatlantic cables, 1, 2 n. 4
32. transformers, 1
33. transistors, 1, 2, 3 nn. 6, 9
34. trees, 1, 2, 3, 4, 5, 6, 7, 8, 9 n. 1
35. troposphere, see Earth: troposphere
36. Tsiolkovsky, Konstantin, 1
37. tuberculosis, 1
38. tubulin, 1
39. Turing, Alan, 1, 2, 3 n. 4
40. Turkey, 1
41. Tutu, Desmond, 1, 2 n. 6
42. Twain, Mark, 1, 2
43. Twitter, 1 n. 7, 2 n. 17
44. Tyndall, John, 1
45. Tyson, Neil deGrasse, 1