Why does Tony Stark need an arc reactor?

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Tags

1. #piece
2. #power
3. #reactor
4. #chest
5. #fragments
6. #something
7. #fiction
8. #heart
9. #there
10. #magnitudes
11. #killing
12. #energy
13. #capable
14. #keeps
15. #shrapnel
16. #second
17. #great
18. #because
19. #science
20. #created
21. #essential
22. #entering