History 52 Man-woman relationships 37 Presidents 18 Families 17 Human-alien encounters 13 Murder 13 World War, 1939-1945 11 more ... Criminal behavior 10 Fathers and sons 10 Friendship 10 Social life and customs 10 Soldiers 10 Terrorism 10 Informers 9 Journalists 9 Conduct of life 8 Drug traffic 8 Government investigators 8 High school students 8 Male friendship 8 Drug dealers 7 Family relationships 7 Politics and government 7 Prisoners of war 7 Economic aspects 6 Film adaptations 6 Investigation 6 Mothers and sons 6 Prevention 6 Teenagers 6 less ...