Dr. Elan Kaufman at PS 64-Display with Colgate

Dr. Elan Kaufman at PS 64-Display with Colgate


This video, https://www.youtube.com/watch?v=391C4SPzfgk, can also be seen at https://www.youtube.com/channel/UCYSJEAPqTPvCV2BUh53YLrA.

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