Twenty-one children died in India yesterday after eating school lunch food that had been contaminated with insecticide. Authorities are still investigating what happened there, but the Generation Anthropocene podcast has a related episode I wanted to point you towards in the meantime. It’s about the struggle to understand the causes behind the largest mass poisoning in history, which began in Bangladesh in the 1980s and is still happening. The 25-minute podcast covers the work of the epidemiologists, doctors, and geologists who figured out that the skin lesions and organ damage affecting millions of Bangladeshis were caused by arsenic … and then uncovered where all that arsenic was coming from.