1. Dallas, Texas, 1
2. Dalrymple, David, 1 n. 13
3. dark energy, 1, 2, 3, 4 n. 16, 5 n. 13
4. dark matter, 1, 2, 3, 4 n. 15
5. Darwin, Charles, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 n. 2, 13 nn. 3, 4;
   1. The Origin of Species, 1
6. Davisson, Clinton, 1, 2 n. 8
7. Dawkins, Richard, 1, 2, 3, 4, 5, 6, 7, 8;
   1. The Blind Watchmaker, 1
8. DC (direct current), 1, 2
9. de Broglie, Louis, 1, 2 n. 14
10. dead, burial of, 1
11. decay, 1, 2, 3 n. 12
12. decimal, 1
13. Deep Time, 1
14. democracy, 1
15. Democritus, 1, 2, 3, 4, 5 n. 3
16. dendrites, see neurons
17. Dennett, Daniel, 1
18. density, 1, 2, 3, 4, 5 n. 13
19. design, illusion of, 1, 2
20. deuterium, 1 n. 2
21. developing countries, 1
22. Diamond, Jared, 1, 2, 3
23. diarrhoea, 1
24. Dickens, Charles, 1
25. Dickinson, Emily, 1
26. Diller, Phyllis, 1
27. dinosaurs, 1, 2, 3
28. diploid, 1
29. Dirac, Paul, 1
30. DNA (deoxyribonucleic acid), 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 nn. 5, 12; 20 n. 13;
    1. copying, 1, 2, 3, 4 n. 6;
    2. crossover, 1;
    3. information storage, 1 n. 4; 2 n. 8;
    4. human, 1, 2;
    5. mitochondrial, 1 n. 13;
    6. mutation, 1, 2;
    7. packaging, 1 n. 10;
    8. plant, 1;
    9. protein expression, 1, 2, 3;
    10. redundancy, 1;
    11. structure, 1, 2, 3, 4 n. 4;
    12. supercoiling, 1 n. 10;
    13. see also adenine, chromosomes, cytosine, guanine, human beings, thymine
31. Dobzhansky, Theodosius, 1
32. dogs, 1, 2, 3 n. 6
33. domestic appliances, 1, 2, 3
34. dopamine, 1
35. doping, see atoms: doping doppelgänger, 1–9
36. dot-com bubble, 1, 2 n. 2
37. Drake Passage, 1
38. Durant, Will, 1