Adjuvants play a crucial role in many vaccines’ effectiveness. Some scientists say there needs to be more research into developing a wider variety of adjuvants because of how important they are.
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In Lebanon’s devastated capital, at least 137 people are dead and some 5,000 injured. A question looms over the stockpile of 2,750 tons of ammonium nitrate believed to have exploded: Why was it there?Listen — 6:14