Can we travel back in time?

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Tags

1. #science
2. #machine
3. #allowed
4. #general
5. #engineers
6. #there
7. #actually
8. #distortions
9. #scientists
10. #space
11. #before
12. #because
13. #relativity
14. #occur
15. #traveler
16. #special
17. #theories
18. #account
19. #missions
20. #built
21. #operate
22. #travel