How cold is too cold for humans?

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Tags

1. #usually
2. #temperature
3. #degrees
4. #takes
5. #happen
6. #mysterious
7. #delimit
8. #whether
9. #death
10. #known
11. #drops
12. #their
13. #person
14. #harder
15. #expires
16. #hibernation
17. #latent
18. #which
19. #depends