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There are four main types of blood - A, B, AB, and O, then there's positives and negatives?
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The Science Guy Weighs in on BP Tests – CNN, July 14

By Bill Nye | Published: July 14, 2010 – 9:27 pm

One Response to “The Science Guy Weighs in on BP Tests – CNN, July 14”

  1. matt says:
    August 6, 2010 at 8:18 am

    cant see video

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