Why is Iron Man's blood toxic?

Related questions

1. Why was Terrence Howard recast in Iron Man?
2. How much did Robert Downey Jr make in Iron Man?
3. Why did they replace Terrence Howard?
4. Who auditioned for Ironman?
5. Why Tony Stark has hole in his chest?
6. Does Tony Stark have PhD?
7. Did Tony Stark remove the shrapnel?
8. Why did rhodey change in Iron Man 2?
9. Who else auditioned for friends?
10. What happened to Iron Man's heart?

Tags

1. #toxic
2. #heart
3. #keeps
4. #power
5. #responsibility
6. #black
7. #reactor
8. #blood
9. #lines
10. #beating
11. #chest
12. #giving
13. #poisoning
14. #because
15. #about
16. #taking
17. #spreading
18. #along
19. #great