If you want to fight or — even better — prevent a mold problem, it helps to know the enemy. So let’s start there.

Molds are part of the fungal kingdom, which also includes mushrooms, wood rots, and yeasts. Although many have a physical resemblance, fungi aren’t plants. They don’t use photosynthesis to make food out of sunshine. Instead, fungi are decomposers, turning used-up living material into dirt. When the job is done, they leave few traces of their own...

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