51,470 videos in the index

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  1. 35:16
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  7. 13:52
  8. 0:41
  9. 12:37

    How Do Traffic Signals Work?

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  10. 28:25
  11. 29:44
  12. 11:23

    How to Mine Super Fine Gold

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  13. 5:41

    The first 3D color X-rays

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  14. 11:33
  15. 15:22
  16. 13:54
  17. 37:45
  18. 27:28

    Inquarting Gold With TOO MUCH SILVER

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  19. 21:43
  20. 11:05
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