Read more: https://en.wikipedia.org/wiki/Baking_powder#Single-_and_double-acting_baking_powders
TIL that “double-acting” baking powder generates carbon dioxide to raise baking products at both room temperature and then, using different compounds, at oven temperature. This double-raising effect increases the reliability of the baking process.
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It also means you don’t have to rush it into the oven as soon as you add the baking powder.