13 Oceans or Seas

1. Black Sea
2. Lake Geneva
3. Pacific Ocean
4. Atlantic Ocean
5. Adriatic Sea
6. Arctic Ocean
7. The North Sea
8. Indian Ocean
9. Caspian Sea
10. Baltic Sea
11, Mediterranian Sea
12. Bering Sea
13. Sea of Tranquility (it's on the moon)

13 different Diseases

1. Alzheimer's diseases