- Campaign finance
- Campus safety
- Cancer
- Careers in your major
- Caretaker abuse
- Casual gaming
- Cell phone etiquette
- Censorship
- Charter schools
- Chemical warfare
- Child abuse
- Child custody laws
- Christianity (or individual denominations)
- Church-state relations
- Cinco de Mayo
- Civil rights
- Climate change
- Cloning
- Coastal erosion
- Coffee
- Cold cases
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- College athletics
- Comets
- Comic books
- Community Coffee
- Community service
- Composting
- Consumer rights
- Cooking
- Coral reefs
- Corruption (politics, police, administration, etc.)
- Cosmetic surgery
- Cosplay
- Crime scene investigation
- Cross-dressing
- Cross gender
- Cryptology
- Cryptozoology
- Cults
- Cyberbullying
- Cybernetics
- Cyberpunk
- Cyberstalking
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