InsideClimate: When a broken pipeline spills oil into a residential neighborhood, the most immediate health concerns are those caused by volatile chemicalsairborne toxins that leave people complaining of symptoms like headaches and nausea and worrying about long-term problems like cancer. But crude oil also contains small amounts of heavy metals that rarely evaporate into the air. Instead, they stay with the oil as it spills onto the ground and into waterways. These compounds, which include mercury, manganese,...