Man-woman relationships 369 History 233 World War, 1939-1945 160 Families 97 Murder 82 Friendship 67 Human-alien encounters 66 more ... Social life and customs 66 Police 62 Good and evil 60 Campaigns 58 Fathers and sons 55 Revenge 55 Criminal behavior 52 Social conditions 46 Women 45 Criminal investigation 41 High school students 41 Conduct of life 40 Film adaptations 40 Soldiers 39 Male friendship 38 Serial murderers 38 Love 34 Vampires 34 Investigation 33 World War, 1914-1918 33 Married people 32 Time travel 32 Death 31 less ...