Why are flight recorders called black boxes?

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Tags

1. #track
2. #their
3. #pilot
4. #recorders
5. #recording
6. #referred
7. #flight
8. #experts
9. #aviation
10. #detailed
11. #altitude
12. #boxes
13. #black
14. #electronic
15. #normally
16. #information
17. #conversations
18. #position
19. #speed