What is the rarest thing in the universe?

Related questions

1. Is aquamarine a rare gem?
2. How can I tell if an aquamarine is real?
3. Do aquamarines fade?
4. Is an aquamarine a precious stone?
5. What is the best alternative to a real diamond?
6. Is aquamarine a real gemstone?
7. How do you know if gemstones are real?
8. What stone is better than a diamond?
9. How do you clean aquamarine stones?
10. How can you tell if an aquamarine is real?

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2. #valued
3. #writing
4. #commons
5. #world
6. #believed
7. #somewhere
8. #million
9. #diamond
10. #dollars
11. #existence
12. #shakespeare
13. #signature
14. #around
15. #william
16. #rarest
17. #known
18. #still
19. #wikimedia