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    Botswana documents tribal healers' knowledge

    Al Jazeera English

    by Al Jazeera English

    For generations, tribal healers all over the world have used knowledge of plants to treat medical problems.

    They might not have the science to explain why the plants work, but they have the experience.

    And the government in Botswana is trying to record all that is known before it vanishes for good.

    Al Jazeera's Peter Greste has been finding out more in Gaborone.