In developed countries, pap smears are used to detect cervical cancers, but these tests are not available for poor women in developing countries. Brushing the cervix with household vinegar turns cancerous and precancerous lesions pale white within a few minutes. The lesions can then be immediately frozen using metal rod cooled by a tank of carbon dioxide, which is readily available from any soda plant.
This cheap and easy screening test called VIA/cryo has recently been endorsed by the World Health Organization.
Read More & pic from: Fighting Cervical Cancer With Vinegar and Ingenuity, New York Times
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Arun Shanbhag 
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