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How a vegetable detective ignited a controversy around kale
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Life and death amid California's oil and pesticides
Amazon healers are dying off — and they're taking potential cures for cancer, AIDS, and other diseases to the grave
Where the world's health aid goes
Stop flushing your toilet
Fistbumps and germ-zapping robots: Inside the quest to make hospitals more hygienic
The end of smoking?
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