What are those pixels hiding? A lady nipple? Is it, somewhere, cock o'clock? (Source.)
Anyway, back to the quiz!
If any of these images are slightly familiar, it's because I've been to the Mitchell Beazley well once before, here. I don't have the book with me now, alas, to show you, but it's made up of heavily illustrated, two-page chapters, so each of the following illustrations comes from a different chapter, and I've jumbled up the titles. That's right. Jumbled. Can you unjumble them? Have you the time and inclination to scroll endlessly up and down this page and do that? Can't you just leave things as they are? I'll post the correct answers in the comments, for all the good it will do you.
1. How the brain works

2. Moral development
3. Adolescence
4. "Keeping fit"
6. Adulthood from 20 to 30
7. Behaviour therapy
8. The meaning of ritual
9. Body image and biofeedback
10. Potential of the mind
11. Prejudice and group intolerance
12. Birth control
13. Alcoholism and drug abuse
14. Work: curse and pleasure
15. Family of man: how peoples differ
16. Origins of human society
17. Religion and the plight of modern man
18. Development of surgery
19. Diseases of the nervous system
20. What is philosophy