What blocks WiFi signals?

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Tags

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2. #ceramic
3. #still
4. #visible
5. #signals
6. #brick
7. #plaster
8. #mirrors
9. #worse
10. #metal
11. #glass
12. #stone
13. #light
14. #think
15. #blocks
16. #everything
17. #water
18. #radio
19. #which
20. #problematic
21. #interfere
22. #gallon
23. #little
24. #alike
25. #cinder
26. #waves
27. #concrete