Periodic_Table_History_Part_1-B.mp4
7:59
Added: 2 years ago
From: davidvblack
Views: 2,227
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  • Your vid went viral on Kabul

    jessehaley615 1 month ago

  • This video went viral on Azerbaijan

    wyattorr820 2 months ago

  • David, these are GREAT!!!! Thanks for letting these out. I am using them to show 8th graders in Jacksonville, FL!

    Sowerskf01 4 months ago

  • these people were living in the dark ages compared to the physicist I have substituted as teachers

    sn1pe352 1 year ago

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