Why is energy never created or destroyed?

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Tags

1. #rather
2. #conservation
3. #remains
4. #states
5. #conserved
6. #transferred
7. #destroyed
8. #isolated
9. #created
10. #another
11. #constant
12. #transformed
13. #means
14. #chemistry
15. #physics
16. #energy
17. #system
18. #total
19. #neither