http://www.scientificamerican.com/article.cfm?id=groundwater-contamination-may-end-the-gas-fracking-boom&fb_action_ids=543475282392531&fb_action_types=og.likes&fb_source=other_multiline&action_object_map=%5B402475579854415%5D&action_type_map=%5B%22og.likes%22%5D&action_ref_map=%5B%5D
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